geometry
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.

AngleBPC+angleBQC=180 degrees
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.
AngleBPC+angleBQC=180 degrees