Point o is the incenter of triangle abc. point o is the incenter of triangle a b c. lines are drawn from the points of the triangle to point o. lines are drawn from point o to the sides of the triangle to form right angles and line segments o q, o r, and o s. angle o b c is 15 degrees. angle o c r is 30 degrees. what is mangleqob? 30° 60° 75° 90°