1)in a triangle, if A=2B prove that a^2=b^2 + bc

2)in a triangle, if a+c=2b prove that cot(C/2) = 3 tan(A/2)

PS please dont use calculus to solve!

Results 1 to 4 of 4

- June 18th 2007, 12:24 AM #1

- Joined
- Apr 2007
- Posts
- 32

- June 18th 2007, 04:42 AM #2
In general there is a difference between the variables "b" and "B." When referring to triangles B tends to represent the angle across from the side of length b. The first question, with then, makes no sense. Even if you meant b = B, there are a variety of triangles with the property with different values of c so the proposed equality need not be true.

-Dan

- June 18th 2007, 10:33 AM #3

- June 19th 2007, 03:01 AM #4

- Joined
- Apr 2007
- Posts
- 32