如图,AB∥CD,PB平分∠ABC,PC平分∠DCB,则∠P=_度.
问题描述:
如图,AB∥CD,PB平分∠ABC,PC平分∠DCB,则∠P=______度.
答
∵AB∥CD,
∴∠ABC+∠DCB=180°;
∵PB平分∠ABC,PC平分∠DCB,
∴∠P=180°-
(∠ABC+∠DCB)=90°.1 2