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Question: A crescent is formed by two circles which touch at A. C is the centre of the larger circle. The width of the crescent at BD is 9 cm and at EF is 5 cm. Find:
(i) The radii of two circles.
(ii) The area of the shaded region.

Answer:

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cos A — sinA + 1 ÷ cosA + sinA — 1 = cosecA + cotA. Prove using cosec square A = 1+cot square A

Posted by Josmy Wency 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Khushi Agrawal 6 years, 10 months ago

=[CosA—SinA +1/CosA+Sin—1]×[CosA +SinA +1/CosA +SinA +1] =[Cos²A+CosA.SinA+CosA—CosA.SinA—Sin²A—SinA+CosA+SinA+1]/(CosA+SinA)²—(1)² =[Cos²A+2CosA+1—Sin²A]/[Cos²A+Sin²A+2SinACosA—1]---- [:CosA.SinA—CosA.SinA=0, SinA—SinA=0] ----=[2Cos²A+2CosA]/[1—1+2SinA.CosA]---- [:1—Sin²A=Cos²A and Cos²A+Sin²A=1] =[2CosA(CosA+1)/[2SinA.CosA] =CosA+1/SinA---- ----[2CosA/2CosA=1] =CosA/SinA+1/SinA =CotA+CosecA, Hence Prooved

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Deepanshi Mittal 6 years, 10 months ago

It's N.C.E.R.T ques

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1+sin^2A = 3sinAcosA then prove that tanA=1 or 1/2

Posted by Fidha Hameed 6 years, 10 months ago

CBSE > Class 10 > Mathematics

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Which term of A.P. 92, 88, 84, 80 ................. is 0 ?

Posted by Karam Veer 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

ANSWER

Triangle ex 6.5 15 and 16 question

Posted by Trish Khandelwal 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

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Who is prepare for board exam

Posted by Music ?? Lover?? 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Sw Kkk 6 years, 10 months ago

What english???

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In ABC,if AD is the median,show that ab2 +ac2=2(ad2+bd 2)

Posted by Sumit Kashyap 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

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What all are important in triangles chapter????

Posted by Jiya Arora????? 6 years, 10 months ago

CBSE > Class 10 > Mathematics

3 answers

Deepanshi Mittal 6 years, 10 months ago

BPT ,converse of BPT , Pythagoras , Area theorems Ex 6.5 13,14,15,16 sums

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Puja Sahoo? 6 years, 10 months ago

All theorem specially, bpt and pythagoras

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Aditya Kishore 6 years, 10 months ago

All theorems are important and related to their questions

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how many numbers are between 700 and thousand which has tens digit greater than once and hundreds digit greater than tens

Posted by Sahil Saklani 6 years, 10 months ago

CBSE > Class 10 > Mathematics

0 answers

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If the point A(-2,1) B(a,b) C(4,-1) are collinear and a-b=1 find a and b

Posted by Shivani Rawat 6 years, 10 months ago

CBSE > Class 10 > Mathematics

3 answers

Deepanshi Mittal 6 years, 10 months ago

Please send the solution

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Nidhi Chaudhary 6 years, 10 months ago

a=1 nd b=0

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Puja Sahoo? 6 years, 10 months ago

Use, ar. of triangle =0.... and then yu will find value of b put it in given eq. yu will get the answer

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If the mth term of an AP is 1/n and the nth term is 1/m,show the sum of its first (mn)terms is 1/2(mn+1).

Posted by Priyanshu Sharma 6 years, 10 months ago

CBSE > Class 10 > Mathematics

2 answers

Rita Gokani 6 years, 10 months ago

am=1/n, an=1/m a + (m-1)d = 1/n a + (n-1)d = 1/m By solving we get d=1/mn Also a=1/mn Then, S(mn)=mn/2[2(1/mn)+(mn-1)1/mn] =mn/2[2/mn +1 - 1/mn] =mn/2[2/mn-1/mn+1] =mn/2(1/mn+1) by multiplying =mn/2×1/mn+mn/2+1 LCM =1/2 +mn+2/2 =mn+2/2 =1/2mn +1 Hope u understood

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Nanu Parjapat 6 years, 10 months ago

Yd7373uh3

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If an ap of 50 terms the sum of first 10 terms is 210 and the sum of its last 15 terms is 2565 find the AP

Posted by Kundan Sharma 6 years, 10 months ago

CBSE > Class 10 > Mathematics