Question

Let ABC be a triangle in which AB=AC and I be its in-centre . Suppose BC = AB + AI . find angle BAC

Answer 1

This is a pig of a question, it looks like something might possibly drop out if I can convert everything to r and look at Tan theta/2.

Do u actually have a solution (if u do, don't tell me, just tell me that u have one).

Answer 2

yes i have one

Answer 3

angle ABC is 90 degree right?

Answer 4

no
hint abc is a right triangle but angle b is not 90

Answer 5

Now we know the answer, I still haven't managed to demonstrate it though.

I got an equation for theta saying there is no real solutions....:-(

Answer 6

Can't see the wood for the trees....see diagram.

The 2 little triangles containing x (theta 2) are congruent) so d = r and

Sin x = Cos x ie 45 degrees so BAC is 90.

Answer 7

if u want i can give u the solution

Answer 8

Above is a solution.

Answer 9

yaa
didnt see it clearly
sorry