# math

posted by
**sunny**
.

In a triangle ABC , the internal bisectors of angles B and C meet at P and the external bisectors of the angles B and C meet at Q. prove that:

angle BPC + angle BQC = 2 rt. angles.

posted by
**sunny**
.

In a triangle ABC , the internal bisectors of angles B and C meet at P and the external bisectors of the angles B and C meet at Q. prove that:

angle BPC + angle BQC = 2 rt. angles.