The point P is the two angle flat lines of △ ABC. Seeking corner A degree.
See the figure one as shown in the figure: In △ ABC, the angle flat division of BP and CP intersect at point P. If ∠BPC = 150 °, then ∠a = ______.
See the figure one as shown in the figure: In △ ABC, the angle flat division of BP and CP intersect at point P. If ∠BPC = 150 °, then ∠a = ______.