CBSE > Class 10 > Mathematics | CBSE Board | Homework Help

Draw a line segment AB of length 5cm.
Taking B as point Construct an angle of measure 60^o using a compass.
Name the angle as angle ABX.
Draw a line EF at a height of 3 cm such that it is parallel to the line segment AB. It must intersect ray BX at point C. Now join AC.
Draw CD perpendicular to AB. CD is altitude of triangle ABC having height 3cm.

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Chirayu . 6 years, 9 months ago

how can i send u the construction

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From a point P, two tangent PA PB are drawn to a circle with centre O and radius r. If OP 2r, show that triangle APB is equilateral

Posted by Sahil Khan 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Amaresh Basu 6 years, 9 months ago

the diameter of the circle , show that ∆APB is equilateral. Report by Abinaya20 01.04.2017 Answers THE BRAINLIEST ANSWER! swathika23 Swathika23 Ace ∠OAP = 90°(PA and PB are the tangents to the circle.) In ΔOPA, sin ∠OPA = OA/OP = r/2r [OP is the diameter = 2*radius] sin ∠OPA = 1 /2 = sin 30 ⁰ ∠OPA = 30° Similarly, ∠OPB = 30°. ∠APB = ∠OPA + ∠OPB = 30° + 30° = 60° In ΔPAB, PA = PB (tangents from an external point to the circle) ⇒∠PAB = ∠PBA ............(1) (angles opp.to equal sides are equal) ∠PAB + ∠PBA + ∠APB = 180° [Angle sum property] ⇒∠PAB + ∠PAB = 180° – 60° = 120° [Using (1)] ⇒2∠PAB = 120° ⇒∠PAB = 60° .............(2) From (1) and (2) ∠PAB = ∠PBA = ∠APB = 60° all angles are equal in an equilateral triangle.( 60 degrees) ΔPAB is an equilateral triangle hope it helps!!!!

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Find the value of 'k' so that equations have equal roots Kx(x-2) +6=0

Posted by Mayank Pruthi 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Ronak Jain 6 years, 9 months ago

D=b2- 4ac=0 (-2k)2 -4(k)(6)=0 (4k)2-4k(6)=0 16k2-24k=0 16k2=24k K=6

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Amaresh Basu 6 years, 9 months ago

Kx (x-2)+6=0 => kx^2-2kx+6=0 Now this equation has equal roots Therefore D=0 =>b^2-4ac=0 =>(-2k)^2-4×k×6=0 =>4k^2-24k=0 =>4k (k-6)=0 =>k=0 or k=6

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Solve for x and y X/a +y/b = 2 ax - by = a 2 - b 2

Posted by Ronak Jain 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Amaresh Basu 6 years, 9 months ago

x/a + y/b = 2 ay + xb = 2ab----------( 1 ) ax - by = a² - b²---------( 2 ) from-----( 1 ) &-------( 2 ) multiply ( 1 ) by "a" ( 2 ) by "b" abx + a²y = 2a²b abx - b²y = ba² - b³ ------------------------------------------------- y(a² + b²) = 2a²b - ba² + b³ y(a² + b²) = a²b + b³ y(a² + b²) = b(a² + b²) y = b [ put in -----( 1 )] we get, ay + xb = 2ab a(b) + xb = 2ab xb = 2ab - ab x =ab/b x=a

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Chirayu . 6 years, 9 months ago

is that a2 or a^2

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An umbrella has 8 ribs which are spaced as a flat circle of radius 45 CM, find and area of two consecutive ribs of the umbrella.

Posted by Vedant Ghuge 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Affu 😊 6 years, 9 months ago

Here radius = 45cm and theta = 360/8 = 45° .... Area btw two ribs of umbrella = pie r^2theta /360 = 22/7x45x45x45/360 = 22275/28 cm^2

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prove that √7 is irrational (plz write step by step)

Posted by Chirayu . 6 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Rahul Singh 6 years, 9 months ago

Let root 7 be a rational number Then root 7 is equal to p upon q where p and q are coprime integers and q is not equals to zero........ By squaring both sides.... 7=p²/q²........ q²=p²/7 If 7 divides p² 7 also divides p..... Let p=7c...... q²=49c²/7......... q²=7c²......... q²/7=c²...... If 7 q² then 7 also divides q...... Hence p and q are not coprime integers..... Our assumption was wrong that √7 is a rational number........ Root 7 is not a rational number..... Root 7 is an irrational number

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Chirayu . 6 years, 9 months ago

what types of Questions have chances to come in board xams from ch 1

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Amaresh Basu 6 years, 9 months ago

You can see in text book page 13...there it is proved that root3 is irrational....u can get help from there

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Find a cubic polynomial whose zeros are 1/2,1 and -3

Posted by Ramkrishan Giri 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Affu 😊 6 years, 9 months ago

2x^3 + 3x^2 -8x + 3

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Rahul Singh 6 years, 9 months ago

2x³+3x²-4x+3

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In circle in which a centre o the length of a tangent AP are 4cm and radius OP are 2cm then find the length of OA

Posted by Ronak Jain 6 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Chirayu . 6 years, 9 months ago

4.47213595 cm

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Affu 😊 6 years, 9 months ago

2√5

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Rahul Singh 6 years, 9 months ago

√20

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Place a and b are 100km apart on a highway . One car starts from a and another from b at the same time.if the cars travel in the same direction at different speeds they meet in 5 hours .if they travel towards each other they meet in 1 hours .what are the speeds of the two cars

Posted by Mamta Gangwar 6 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Aditya Mandal 6 years, 9 months ago

Speed of car 1= 60 km/hr Speed of car 2=40km/hr

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Affu 😊 6 years, 9 months ago

Let speed of car a be x and speed of car b be y , speed = distance/ time = 100/5 = 20 and again 100/1= 100 , then car travel in same direction , x-y= 20 -----(i) and the car travel toward each other , x+y=100 -----(ii) then slove both equation and the answer is the peed of car a is 60 and the speed of car b is 40

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Amaresh Basu 6 years, 9 months ago

Book ka question hai....exercise 3.5 ka Q4 me dekho (iv) number

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what is the formula of finding a cubic polynomial when sum , product and , sum of product of zeroes taken 2 at a time are given. Plz ans. as soon as possible. ..?☺

Posted by Eliza ? 6 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Eliza ? 6 years, 9 months ago

Tanks Honey. .?

1Thank You

Aditya Mandal 6 years, 9 months ago

X^3-(sum)x^2+ (2 at a tym)x -(product )

2Thank You

Honey ??? 6 years, 9 months ago

X^3-(sum of 0s)x^2+(prd.of 0s taken 2 at a time )x-(product of 0s)

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ANSWER

√7 is irrational no

Posted by Ashish Kumar 6 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Ayushi Jain 6 years, 9 months ago

Yes

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Aditya Mandal 6 years, 9 months ago

Yaa it is

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Amaresh Basu 6 years, 9 months ago

Yes

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ANSWER

If the zeros of polynomial are 3+√5 and 3-√5 . Find the polynomial

Posted by Sangita Roy 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Aditya Mandal 6 years, 9 months ago

Xsq.-6x+4

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Affu 😊 6 years, 9 months ago

x^2 - 6x + 4

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ANSWER

In the below figure line segment df intersect the side ac of a triangle abc at the point e such that e is the mid point of ca and angle aef and angle afe . Prove that bd / cd = bf/ ce

Posted by Ritika Niwas 6 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Amaresh Basu 6 years, 9 months ago

Figure chahiye solve krne ke liye

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Affu 😊 6 years, 9 months ago

Fig???

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Nitesh Kumar 6 years, 9 months ago

Kya

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Find the HCF 135 and 225

Posted by Tanu Baby 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Nitesh Kumar 6 years, 9 months ago

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An aeroplane is flying at a height of 3000 m an observer finds his angle of Elevation 60°and after 6sec. It changes into 45° what is the speed of the aeroplane

Posted by Khushi Gøél 6 years, 9 months ago

CBSE > Class 10 > Mathematics

3 answers

Chirayu . 6 years, 9 months ago

211.325 m/s (approx)

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Aditya Mandal 6 years, 9 months ago

Metre per second

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Aditya Mandal 6 years, 9 months ago

500 root 3/ 3

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ANSWER

In triangle PAB, PA=PB. Find the coordinates of P if A(1,2) B(3,8) and area of triangle PAB=10sq.units

Posted by Sneha V 6 years, 9 months ago

CBSE > Class 10 > Mathematics

1 answers

Rahul Singh 6 years, 9 months ago

41/10,43/10

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In RD sharma Pg no 11.24 Question no 11 Please

Posted by Rahul Kumar 6 years, 9 months ago

CBSE > Class 10 > Mathematics

2 answers

Rahul Kumar 6 years, 9 months ago

X=2

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Ram Kushwah 6 years, 9 months ago

See at following l ink I don,t have RD sharma book:

https://www.topperlearning.com/study/cbse/class-10/mathematics/text-book-solutions/r-d-sharma-mathematics-x/42/trigonometric-identities/277/b101c2s3e9

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