Prove that the angle between the segments from the incenter to two vertices of a triangle has a radian measure equal $\pi/2$ plus one-half the measure of the angle of the triangle at the third vertex
Can someone tell me why we have to show $b = \pi/2 + z/2$? When it says the angle between the segments from the incenter to two vertices... why can't that angle be w? Isn't that also between the segments joining the incenter to the vertices of the triangle?
This may seem like a dumb question, but I am trying to get myself more familiar with reading these geoemtry problems. Please don't solve the problem