Apply the formula from Problem 49 to triangle OPQ to show that The lines that bisect each

Question:

Apply the formula from Problem 49 to triangle OPQ to show that

B sin - 2 c sin Cos cos

The lines that bisect each angle of a triangle meet in a single point O, and the perpendicular distance r from O to each side of the triangle is the same. The circle with center at O and radius r is called the inscribed circle of the triangle (see the figure).

0. b.