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ANSWER

bisector of interior angle b and exterior angle acd of a triangle abc intersect at point p if the d is the midpoint of the hypotenuse AC of a right triangle ABC proveq that BD=1/2AC

Posted by 〘』Ֆѧťᵞꭿ『〙 _ 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 1 month ago

Given:- ∆ABC is a triangle where BT and CT are internal and external bisectors of <ABC and <ACB respectively and they meet at T.

RTP:- <BTC = 1/2 <BAC

Construction:- Let, BC is produced to D and the external <ACD is formed.

Proof:-

In ∆ABC,

Exterior <ACD = interior opposite angle ( <ABC + <BAC )

=) 1/2 <ACD = 1/2 <ABC+ 1/2 <BAC

=) <TCD = <TBC + 1/2 <BAC ......( 1 )

In ∆TBC,

<TCD = <BTC + <TBC ........( 2 )

From ( 1 ) and ( 2 ),

<TBC + 1/2 <BAC = <BTC + <TBC

=) 1/2 <BAC = <BTC

=) <BTC = 1/2 <BAC

[ PROVED ]

ANSWER

the side of a triangle are 11cm ,15cm and 16 cm .find its area.also fide altitude corresponding to its shortcut side?

Posted by Shivna Chouhan 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 2 months ago

area= √(s-a)(s-b)(s-c)
s=11+15+16/2
=21cm
area=√21*(21-11)(21-15)(21-16)
=√ 21*10*6*5
=√ 7*3*5*2*3*2*5
=5*3*2√7
=30√t7
area=1/2*b*h
b=16cm
30√7=1/2*16*h
h=30√7/8
=15√7/4

ANSWER

Find a rational number between 2 and 3 Your answer

Posted by Prathipa Murugan 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Kashish Choudhary 5 years, 2 months ago

3/2;5/2

Lav Khator 5 years, 2 months ago

5/2

ANSWER

A cubodial oil tin has 40cm length,30cm breadth and 50cm height.Find the cost of tin required for making 20 such tins if the cost of tin sheet is ₹20 per metre square?

Posted by Subham Mallick 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 2 months ago

dimension of cuboidal tin = 30cm×40cm×50cm
let length = 40cm
breath = 30cm
height = 50cm
Total surface area = 2(lb+bh+lh)
= 2(40×30 + 30×50 + 40×50)
= 2(1200 + 1500 + 2000)
= 2(4700)
= 9400 cm²
TSA of one tin box = 9400 cm²
TSA of 20 tin boxes = 9400×20 = 18800 cm² = 1.88m²
Cost of tin = Rs. 20/m²
Total cost = 1.88×20 =Rs. 37.60

ANSWER

Can anyone tell me that what is congruent ?

Posted by Harshita Gupta 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Subham Mallick 5 years, 2 months ago

Two shapes idential or coinciding exactly each other.

ANSWER

Anyone can tell me the answer of question no.2 of chapter 7 of exercise no.7.4 its confusing me??????

Posted by Yash Joshi 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Vidhi Srivastav 5 years, 2 months ago

If you tell that of which class you are asking ,will be better to understand

ANSWER

Expand each of the following, using suitable indentities: (x+2y+4z)^2

Posted by Angshuman Talukdar 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Yogita Ingle 5 years, 2 months ago

(x + 2y + 4z)² = (x)² + (2y)² + (4z)² + 2(x)(2y) + 2(2y)(4z) + 2(4z)(x)|

Using Identity V

= x² + 4y² + 16z²+ 4xy + 16yz + 8 zx.

ANSWER

Name all the types of quadrilateral..

Posted by Bhumika Jaiswal 5 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Subham Mallick 5 years, 2 months ago

Rectangle,Square,Parallelogram,Rhombus,Trapezium and Kite are different types of quadrilateral.

Yogita Ingle 5 years, 2 months ago

The various types of quadrilaterals are

1. Parallelogram: As the name suggests, a parallelogram is a quadrilateral with parallel opposite sides.

2. Rectangle: The Rectangle is also a type of parallelogram with a little difference in the angles of the sides. In a rectangle, all the sides are at the right angle or to say perpendicular to each other.

3. Square: A square is a quadrilateral with all four sides equal. Every vertex of a square makes a right angle with its sides.

4. Rhombus: A rhombus is also a parallelogram but with all sides equal. In other words, a parallelogram that shows e resemblance to a square as regards its lengths of sides is called a rhombus.

5. Trapezium: Amongst the other types of quadrilaterals, a trapezium shows different characteristics, In a trapezium, only one pair of the four sides are parallel to each other.

Riya Mangang 5 years, 2 months ago

Trapezium, parallelogram, kite, rhombus, square, rectangle,

ANSWER

X⁵ + y⁵

Posted by Keshav Agarwal 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Riya Mangang 5 years, 2 months ago

(x+y)⁵

ANSWER

A cube has numerically equal volume and surface area the volume of such a cube is

Posted by Chanchal . 5 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Ananya K 5 years, 2 months ago

Let L be the length of the cube as per the given condition, Volume (L 3 )=surface area (6L 2 ) or L=6 So, Volume=6 3 =216

ANSWER

(2+3)-(6+7)

Posted by Md Asif 5 years, 2 months ago

CBSE > Class 09 > Mathematics

5 answers

Subham Mallick 5 years, 2 months ago

It would be -8

Ashirwad Chauhan 5 years, 2 months ago

(2+3)-(6+7) =5-13 =-8

Yogita Ingle 5 years, 2 months ago

(2+3)-(6+7)

= 5 - 13

= - 8

Rajkishor Giri 5 years, 2 months ago

Answer: (2+3)-(6+7) =2+3-6-7 =-8

Md Asif 5 years, 2 months ago

-4 answer

ANSWER

If (1, −2) is a solution of the equation 2x – y = p, then find the value of p.

Posted by Dharmik Girsay 5 years, 2 months ago

CBSE > Class 09 > Mathematics

4 answers

Kashish Choudhary 5 years, 2 months ago

2x-y=p (x=1;y=-2) =2×1-(-2)=p =2+2 =p =4=p The value of p is 4

Ashmit Patel 5 years, 2 months ago

2x-y=p Put the value of x=1 and y= -2, 2×1-(-2)=2+2=4

Jayanti Rawat 5 years, 2 months ago

2(1)-(-2)=2-2=1

Sandeep Singh 5 years, 2 months ago

(x,y)=(1,-2) putting the value of x and y in 2x-y=p =2*1-(-1)=2+1=3 therefore p=3

ANSWER

0.235 BAR WRITE IN THE FROM OF P/Q

Posted by ꧁??Nsg ??꧂ ꧁?? Gaming??꧂ 5 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Kashish Choudhary 5 years, 2 months ago

Let x =0.235235....(1) multiply by 1000 both sides 1000x=235.235....(2) Subtract equation 1 from 2 999x=235 x=235/99 Note: Mene 1000 se multiply isliye kiya kyunki jitne no.ke upar bar hota h utne hum zero lagate h.

Subham Mallick 5 years, 2 months ago

Let x=0.235235.......... -----(1) Multiply 100 on both sides. 100x=235.235235.....------(2) Subtract both equation 1&2 99x=235 x=235/99

ANSWER

2x-3=9

Posted by Shaurya Dwivedi Shaurya Dwivedi 5 years, 2 months ago

CBSE > Class 09 > Mathematics

5 answers

Kashish Choudhary 5 years, 2 months ago

2x-3=9 2x=9+3 2x=12 x=12/2=6

Jiya ??? 5 years, 2 months ago

X=6

Ashirwad Chauhan 5 years, 2 months ago

2x-3=9 2x=9+3 2x=12 x=12÷2=6

Aashna Jaiswal 5 years, 2 months ago

2x-3=9 2x=9+3 2x=12 x=12/2 x=6

Student 10Th 5 years, 2 months ago

2x-3=9 2x=9+3 2x=12 x=12/2 x=6

ANSWER

Perimeter and area of rhombus

Posted by Divya Raina 5 years, 3 months ago

CBSE > Class 09 > Mathematics

4 answers

Jiya ??? 5 years, 2 months ago

P=4×length of sides A=half × d1 × d2

Ashmit Patel 5 years, 3 months ago

Perimeter of rhombus = 4a Area of rhombus =1/2×d1×d2

Student 10Th 5 years, 3 months ago

And perimeter P=4a Where is side

Student 10Th 5 years, 3 months ago

(d¹×d²)/2 is area of rhombus

ANSWER

What and we can do CPCT

Posted by C Abbi 5 years, 3 months ago

CBSE > Class 09 > Mathematics

3 answers

Teena Choudhary 5 years, 3 months ago

CPCT-corresponding parts of congruent triangles (full form-congruent triangles corresponding parts)

Anshul Rana 5 years, 3 months ago

CPCT used when 2 triangle are congurant

Bhumika Jaiswal 5 years, 3 months ago

CPCT - Corresponding Parts of Congruent Triangle

ANSWER

A quadrilateral abcb measures ab=12, bc=5 cd=da=10 ac=4 find the area of quadrilateral abcd

Posted by Pooja Mane 5 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Ashmit Patel 5 years, 3 months ago

Given , ab =12 bc=5 cd=da=10 ac=4 Area of quadrilater = area of Ist triangle + area of 2nd triangle 1/2×base×height+1/2×base ×height 1/2×10×10+1/2×12×5 5×10+6×5 50+30 80cm Therfore the area of quadrilateral of abcd =80cm

ANSWER

1/2+√3 +1/2-√3

Posted by Gulshan Bhatia 5 years, 3 months ago

CBSE > Class 09 > Mathematics

2 answers

Aashna Jaiswal 5 years, 2 months ago

1/2+√3+1/2-√3 =1/2+1/2+√3-√3 =2/2 =1

Yogita Ingle 5 years, 3 months ago

1/2+√3 +1/2-√3

= 1/2 +1/2 +√3 -√3

= 2/2

= 1

ANSWER

Ex7.1

Posted by Jasvir Kaur 5 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Chandr Kesh Pal 5 years, 3 months ago

Nice i

ANSWER

In a quadrilateral ABCD ,CO and DO are the bisectors of angle C and angle D respectively. Prove that angle COD= 1\2 (angle A+angle B).

Posted by Trushti Parmar 5 years, 3 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 1 month ago

Angle COD= 1800- 1/2angle C-1/2 angle D=1800-1/2(angle C+D)----------(1)

Angle (A+B+C+D)=3600

AngleC+D= 3600 - AngleA- angle B--------------(2)

Substituting (2) in (1)

Angle COD= 1800-1/2(3600- angle A- Angle B)

Angle COD= 1800-1800+1/2 Angle A + 1/2 Angle B= 1/2(Angle A+ Angle B)