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.

∵AB∥CD,
∴∠ABC+∠DCB=180°;
∵PB平分∠ABC,PC平分∠DCB,
∴∠P=180°-

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(∠ABC+∠DCB)=90°.