In triangle `A B C ,b^2s in2C+c^2sin2B=2b cw h e r eb=20 ,c=21 ,` then inradius= 4 (b) 6 (c) 8 (d) 9

In triangle ABC, b^(2) sin 2C + c^(2) sin 2B = 2bc where b = 20, c = 21 , then inradius =

"In triangle ABC " "c(sin^(2)A+sin^(2)B)=sin C(a sin A+b sin B)

In a triangle A B C , right angled at B , the inradius is (A B+B C-A C)/2 (b) (A B+A C-B C)/2 (A B+B C+A C)/2 (d) none

In a Delta ABC if a^(2)sin(B-C)+b^(2)sin(C-A)+c^(2)sin(A-B)=0, then triangle is

If E is a point on side C A of an equilateral triangle A B C such that B E_|_C A , then A B^2+B C^2+C A^2= 2 B E^2 (b) 3 B E^2 (c) 4 B E^2 (d) 6 B E^2

In any triangle ABC,sin^(2)A-sin^(2)B+sin^(2)C is always equal to (A) 2sin A sin B cos C(B)2sin A cos B sin C(C)2sin A cos B cos C(D)2sin A sin B sin C

In triangle ABC, let /_c=(pi)/(2) .If r is the inradius and R is circumradius of the triangle, then 2(r+R) is equal to a+b(b)b+cc+a(d)a+b+c

In an equilateral triangle A B C if A D_|_B C , then A D^2 = (a)C D^2 (b) 2C D^2 (c) 3C D^2 (d) 4C D^2

In a triangle A B C , if a : b : c=3:7:8,t h e n R : r is equal to a. 2:7 b. 7:2 c. 3:7 d. 7:3

If in a triangle A B C angle B=90^0 then tan^2(A/2) is (b-c)/a (b) (b-c)/(b+c) (c) (b+c)/(b-c) (d) (b+c)/a