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The area of an equilateral triangle having side length equal to √3/4cm is: a. 2/27 sq.cm b. 2/15 sq.cm c. 3/16 sq.cm d. 3/14 sq.cm

Posted by Shimpi Saha 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Anushka Agarwal 5 years, 2 months ago

None of the above. This is because the ans is actually [3(√3)]/64 sq.cm

ANSWER

Supplement or complement meaning

Posted by C Abbi 5 years, 2 months ago

CBSE > Class 09 > Mathematics

4 answers

Sabnam Patri Sabnam Patri 5 years, 2 months ago

Supplement angle - If the sum of two angles are 180 degree then it is said to be supplement angle. Complement angle - If the sum of two angle is 90 degree then it is said to be compplement angle .

Seema Cma 5 years, 2 months ago

If the two line are parallel than their corresponding angles are

Shimpi Saha 5 years, 2 months ago

Supplementary angles- If the sum of two angles is 180° , then it is known as supplementary angles.. Complementary angles- If the sum of two angles is 90°, then it is known as complementary angles...

Gaurav Seth 5 years, 2 months ago

Supplementary angles and complementary angles are defined with respect to the addition of two angles. If the sum of two angles is 180 degrees then they are said to be supplementary angles, which forms a linear angle together. Whereas if the sum of two angles is 90 degrees, then they are said to be complementary angles, and they form a right angle together.

ANSWER

In the given figure ,o is the centre of the circle and angle BOD =150 ° . Find the value of X and y .

Posted by Muskan Mishra 5 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Muskan Mishra 5 years, 1 month ago

Hiiiii

Gaurav Seth 5 years, 2 months ago

In the given figure, O is the centre of a circle and ∠BOD =150°. Find the values of x and y.

Answer:

It is given that O is the centre of a circle and ∠BOD =150^o

We know that

Reflex ∠BOD = (360^o – ∠BOD)

By substituting the values

Reflex ∠BOD = (360^o – 150^o)

By subtraction

Reflex ∠BOD = 210^o

Consider x = ½ (reflex ∠BOD)

By substituting the value

x = 210/2

So we get

x = 105^o

We know that

x + y = 180^o

By substituting the values

105^o + y = 180^o

On further calculation

y = 180^o – 105^o

By subtraction

y = 75^o

Therefore, the value of x is 105^o and y is 75^o.

Uchit Patel 5 years, 2 months ago

Hiiii

ANSWER

Maths lines and angles lesson all question and answer

Posted by Sunil Hadapad 5 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

7 1/5 ____ 7 1/3

Posted by Manvir Kular 5 years, 2 months ago

CBSE > Class 09 > Mathematics

5 answers

Sabnam Patri Sabnam Patri 5 years, 2 months ago

71/5 is greater.

Tanish Tomar 5 years, 2 months ago

Big

Aditi Singh 5 years, 2 months ago

71/5 is a greater

Sakshi Ojha 5 years, 2 months ago

7 1/5 is greater

Focus Pharma 5 years, 2 months ago

7 1/5 is greater

ANSWER

Earning rupees 13000-16000 per month and owning more than 2 vehicles

Posted by Niharika Sahoo 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Sasmita Acharya 5 years, 2 months ago

Please send the full question so we can help you

Ananya K 5 years, 2 months ago

Can u send the complete question

ANSWER

The mean marks of boys and girls in an examination are 70,73 respectively.If mean marks of all the students in that examination is 71.what is the ratio of no of boys to the of girls.

Posted by Yash Yadav 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Ananya K 5 years, 2 months ago

11th Economics Measures of Central Tendency Arithmetic Mean in Statistics The mean marks (out of 100 ... STATISTICS The mean marks (out of 100) of boys and girls in an examination are 70 and 73, respectively. If the mean marks of all the students in that examination is 71, find the ratio of the number of boys to the number of girls. MEDIUM Share Study later VIDEO EXPLANATION ANSWER Let the total number of boys be x and the total number of girls br y. Let the sum of the marks of boys be a and the sum of the marks of girls be b. Mean marks of boys are =70 Mean marks of girls are =73 Therefore, ⇒ x a =70 ⇒a=70x and ⇒ y b =73 ⇒b=73y Now, mean marks of all the students is 71 Therfore, ⇒ x+y sum of the marks of all the students =71 ⇒sum of the marks of all the students=a+b ⇒a+b=70x+73y Therefore, ⇒ x+y 70x+73y =71 ⇒70x+73y=71x+71y ⇒2y=x ⇒ y x = 1 2 Hence the ratio is 2:1

ANSWER

Find p (0), p(1),p(2) for each of the polynomials .. 1) p(y)=y square - y+1 2) p(x) = x cube 3) p(t) = 2+t+2t square -t cube 4) p(x) = (x-1) (x+1)

Posted by Pratham Bhat 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

🖤 🖤 5 years, 2 months ago

1)p(0)=1 2)p(0)=0 3)p(0)=2 p(1)=1 p(1)=1 p(1)=4 p(2)=3 p(2)=8 p(2)=4 4)p(0)=-1 p(1)=0 p(2)=3

ANSWER

Write 100 integers

Posted by Amisha Kumari 5 years, 2 months ago

CBSE > Class 09 > Mathematics

4 answers

Nitin Tripathi 5 years, 2 months ago

You can write anyone from - infinite to + infinite including 0 also.

Sasmita Acharya 5 years, 2 months ago

1 to 100 simple ex

Rahul Kumar 5 years, 2 months ago

You have to simply write no from 1-100

Gaurav Seth 5 years, 2 months ago

All the no.s from 1 to 100 are integers. Integers are no.s other than decimals, for eg., 5 is an integer, 5.1 is non-integer i.e., decimal. Integers are both positive and negative.

ANSWER

Express linear equation x-y=√3 in standard form ax+by+c=0, find the values of a,b,c.

Posted by Sharanya Rumandla 5 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Anushka Agarwal 5 years, 2 months ago

x-y=√3 => x-y-√3=0 => (1)x+(-1)y+(-√3)=0 Thus, value of a is 1. Value of b is -1. Value of c is -√3. Hope it helps:)

Lal Devendra Pratap Singh Deo 5 years, 2 months ago

Sur

Sharanya Rumandla 5 years, 2 months ago

Anyone plz reply fast

ANSWER

X^5 - x factorise by identity

Posted by Archit Gourha 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 2 months ago

X⁵ - x

= x ( x⁴- 1)

=x (x² - 1) (x² + 1)

= x ( x - 1) ( x+ 1) (x² + 1)

ANSWER

Which is the biggest prime number?

Posted by Sameer Kumar 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Yash Rajput 5 years, 2 months ago

2n_1

ANSWER

What is sum of 2+2

Posted by Kuldeep Garg 5 years, 2 months ago

CBSE > Class 09 > Mathematics

5 answers

Gdfyhbbb Hxtdhhfzh 5 years, 2 months ago

Obviously 4

Ashirwad Chauhan 5 years, 2 months ago

Wow! what a lovely question you have asked. I think Einstein would also be not able to solve your problem.

Nandini Sharma 5 years, 2 months ago

Obiuyously four u r in 9 class and u don't know what is 2+2 O God! ?

Sameer Kumar 5 years, 2 months ago

2+2= 4

No Name Unknown 5 years, 2 months ago

4

ANSWER

Exercise 13.2 Question no. 10' 11

Posted by Shivani Mani 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 1 month ago

10. In fig. 13.12, you see the frame of a lampshade. It is to be covered with a decorative cloth.

The frame has a base diameter of 20 cm and height of 30 cm. A margin of 2.5 cm is to be given for folding it over the top and bottom of the frame. Find how much cloth is required for covering the lampshade. (Assume π = 22/7)

Solution:

Say h = height of the frame of lampshade, looks like cylindrical shape

r = radius

Total height is h = (2.5+30+2.5) cm = 35cm and

r = (20/2) cm = 10cm

Use curved surface area formula to find the cloth required for covering the lampshade which is 2πrh

= (2×(22/7)×10×35) cm²

= 2200 cm²

Hence, 2200 cm² cloth is required for covering the lampshade.

11. The students of Vidyalaya were asked to participate in a competition for making and decorating penholders in the shape of a cylinder with a base, using cardboard. Each penholder was to be of radius 3 cm and height 10.5 cm. The Vidyalaya was to supply the competitors with cardboard. If there were 35 competitors, how much cardboard was required to be bought for the competition? (Assume π =22/7)

Solution:

Radius of the circular end of cylindrical penholder, r = 3cm

Height of penholder, h = 10.5cm

Surface area of a penholder = CSA of pen holder + Area of base of penholder

= 2πrh+πr²

= 2×(22/7)×3×10.5+(22/7)×3²= 1584/7

Therefore, Area of cardboard sheet used by one competitor is 1584/7 cm²

So, Area of cardboard sheet used by 35 competitors = 35×1584/7 = 7920 cm²

Therefore, 7920 cm² cardboard sheet will be needed for the competition.

ANSWER

Chapter 9 exercise 9.2 question no. 1

Posted by Sujal Jaiswal 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Devesh More 5 years, 2 months ago

From which school and subject?

ANSWER

What will be the perimeter of the rhombus if the diagonal of a rhombus is 12 and 16

Posted by Himanshu Tiwari 5 years, 2 months ago

CBSE > Class 09 > Mathematics

5 answers

Sabnam Patri Sabnam Patri 5 years, 2 months ago

=1/2×d1×d2 =1/2×12×16 =1/2× 192 =96

Anushka Agarwal 5 years, 2 months ago

And: 40 units

No Name Unknown 5 years, 2 months ago

Rhombus perimeter is 1/2 *D1*D2 where d is diagonals

Ankush Kumar 5 years, 2 months ago

96 is the answer of this question

Ankush Kumar 5 years, 2 months ago

1/2 ×d1×d2

ANSWER

Under root12/3

Posted by [email protected] Rai 5 years, 2 months ago

CBSE > Class 09 > Mathematics

4 answers

Sabnam Patri Sabnam Patri 5 years, 2 months ago

2

Tanish Tomar 5 years, 2 months ago

2

Anushka Agarwal 5 years, 2 months ago

Ans:2 √12/√3=√3*2*2/√3=√2*2(3 is divided by 3). So, 2 comes out. Hence, Ans is 2.

Sarita Panda 5 years, 2 months ago

Ans is 2

ANSWER

Ch 14 ex 14. 2 question no 1

Posted by Aditee Chauhan 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Gawri Sunil 5 years, 2 months ago

Blood group / number of students. A- 9,B- 6,O- 12,AB- 3. TOTAL -30

ANSWER

Perform the following divisions

Posted by Shivendra Parmar Parmar 5 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

12+12+8+9+6+1+1+1++4+747+154245+4+247++476+2+75+4576+26+4+4+61725785+875+577574574545++545454424242782572523+525203256126225652560+5+20102636251360240+4610568132311025+ 1652521243613256+514851256+162458121246+44+++4+4+4+97+95441++4526+

Posted by Rengavadivelammal .C 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Bhavesh B Nair 5 years, 2 months ago

Do you know the answer

ANSWER

Inequalities in a triangle...

Posted by 《Aruba》°°° 《Sayed》❤ 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Sabnam Patri Sabnam Patri 5 years, 2 months ago

Inequality in a triangle is- The three side of the triangle is not equal.

ANSWER

Verify (a+b+c)³ -a³-b³-c³ =3(a+b) (b+c) (c+a)

Posted by ꧁╾━╤デ╦︻ ℛ??????࿐ 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 2 months ago

Prove that (a +b +c)³ -a³ -b³– c³=3(a +b)(b +c)(c +a).

Solution to (a +b +c)³ -a³ -b³– c³=3(a +b)(b +c)(c +a)

ANSWER

What is co linear point

Posted by Yamini Kandpal 5 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Yamini Kandpal 5 years, 2 months ago

Thanks

Sabnam Patri Sabnam Patri 5 years, 2 months ago

The line in which there are 3 point lie in a straight line.

Almi Aami 5 years, 2 months ago

Three or more points , , , ..., are said to be collinear if they lie on a single straight line . A line on which points lie, especially if it is related to a geometric figure such as a triangle, is sometimes called an axis.

ANSWER

If ∆ABC=~∆ACB then ∆ABC is isosceles or

Posted by Risky Priyanshu 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Sayan Roy 5 years, 2 months ago

Yes it can be isosceles triangle but it can also be equilateral triangle and scalene triangle, as per the diagram.

ANSWER

Construct an angle 90 dgree at the initial point of a given ray amd justify tne construction

Posted by Sudarshan Reddy 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 2 months ago

The steps of construction to follow:

Step 1: Draw a ray OP.

Then, take O as the centre and any radius draw an arc cutting OP at Q.

Step 2: Now, taking Q as the centre and with the same radius as before draw an arc cutting the previous arc at R. Repeat the process with R to cut the previous arc at S.

Step 3: Take R and S as centre draw the arc of radius more than the half of RS and draw two arcs intersecting at A. Then, join OA.

Hence, $\angle POA = 90^{\circ }$ .

Justification:

We need to justify, $\angle POA = 90^{\circ }$

So, join OR and OS and RQ. we obtain

By construction OQ = OS = QR.

So, $\triangle ROQ$ is an equilateral triangle. Similarly $\triangle SOR$ is an equilateral triangle.

So, $\angle SOR = 60^{\circ}$

Now, $\angle ROQ = 60^{\circ}$ that means $\angle ROP = 60^{\circ}$ .

Then, join AS and AR:

Now, in triangles OSA and ORA:

$SR = SR$ (common)

$AS = AR$ (Radii of same arcs)

$OS = OR$ (radii of the same arcs)

So, $\angle SOA = \angle ROA = \frac{1}{2}\angle SOR$

Therefore, $\angle ROA = 30^{\circ}$

and $\angle POA = \angle ROA+\angle POR = 30^{\circ} +60^{\circ} =90^{\circ}$

Hence, justified.

ANSWER

What is the sum of all natural numbers?

Posted by Aniket Yadav 5 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Nitin Tripathi 5 years, 2 months ago

Infinite

Rahul Kumar 5 years, 2 months ago

Can you imagine how many people are there in whole world same

Kiran Barthwal 5 years, 2 months ago

Infinity

ANSWER

(3/2y-1)=y+5

Posted by Parvathy Roshan 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Vikramdeep Singh Sekhon 5 years, 2 months ago

3/2y-1 = y+5 3=(y+5) (2y-1) 3=y(2y-1)+5(2y-1) 3=3y-y+10y-5 3+5=12y 8=12y y=8/12 y=2/3

Parvathy Roshan 5 years, 2 months ago

Hlo do anyone know this?☺️

ANSWER

If the points (-3,a) and (b,4) lie on straight line with equation y=4x find a and b

Posted by Bhumika Mittal 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Kiran Barthwal 5 years, 2 months ago

1) y = 4x Put x = -3 and y = a a= 4 ( -3) a = - 12 2) y = 4x Put x = b and y = 4 4 = 4 b b= 4/4 = 1

Yogita Ingle 5 years, 2 months ago

1) y = 4x

Put x = -3 and y = a

a= 4 ( -3)

a = - 12

2) y = 4x

Put x = b and y = 4

4 = 4 b

b= 4/4 = 1

ANSWER

What is value of x

Posted by Saloni Dixit 5 years, 2 months ago

CBSE > Class 09 > Mathematics

4 answers

Pooja Singh 5 years, 2 months ago

'x' Is a variable

Jayant Chaidhary 5 years, 2 months ago

X is a variable

Tejas Agalve 5 years, 2 months ago

X IS A VARIABLES

Mishika Pandey 5 years, 2 months ago

Senseless questions mat dala karo

ANSWER

6+ 10to the power -2 change in decimal

Posted by Ayush Kumar Sinha 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Anushka Agarwal 5 years, 2 months ago

6+(10)-² =6+1/10² =6+1/100 =(600+1)/100 =601/100 =6.01 Ans.. Hope it helps:)

Ayush Kumar Sinha 5 years, 2 months ago

Help

ANSWER

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