B:D::C:?

In Fig. A B||D C . Find the value of x

If (a + b + c + d) (a - b - c + d) = (a + b - c - d) (a - b + c - d) , prove that: a : b = c : d .

A circle touches all the four sides of a quadrilateral A B C D . Prove that: A B+C D=B C+D A .

In the given figure, A B | | D C and A D | | B C show that Δ A B C ≅ Δ C D A .

In triangle A B C ,D is on A C such that A D=B C' and BD=D C ,/_D B C=2x ,a n d/_B A D=3x , all angles are in degrees, then find the value of xdot

In triangle A B C ,D is on A C such that A D=B C' and BD=D C ,/_D B C=2x ,a n d/_B A D=3x , all angles are in degrees, then find the value of x

If cosx/a=cos(x+theta)/b=cos(x+2theta)/c=cos(x+3theta)/d then (a+c)/(b+d) is equal to (A)a/d (B)c/d (C)b/c (D)d/a

In Figure O is the mid-point of A B\ a n d\ C Ddot Prove that \ A O C~=\ \ B O D (b) A C=B D (iii) A C||B D

If (a + b + c + d) : (a + b - c - d) = (a - b + c - d):(a-b-c+d) , then prove that a : b = c :d .

If (a + b + c + d) (a - b - c + d) = (a + b - c - d) (a - b + c - d) , then prove that a : b = c : d