2013 · Q77
The side BC of a triangle ABC is produced to D; bisectors of the angles ABC and ACD meet at P. If ∠BPC = x° and ∠BAC = y°, then which one of the following is correct?
Elementary MathematicsGeometry
- Ax°=y°
- Bx°+y°=90°
- Cx°+y°=180°
- D2x°=y°
Explanation
Exterior angle theorem: x=y/2. Answer D.