25.已知:菱形ABCD和菱形A'B'C'D',∠BAD=∠B'A'D',起始位置點(diǎn)A在邊A'B'上,點(diǎn)B在A'B'所在直線上,點(diǎn)B在點(diǎn)A的右側(cè),點(diǎn)B'在點(diǎn)A′的右側(cè),連接AC和A'C′;將菱形ABCD以A為旋轉(zhuǎn)中心逆時(shí)針旋轉(zhuǎn)α角(0°<α<180°).
(1)如圖1,若點(diǎn)A與A′重合,且∠BAD=∠B'A′D'=90°,求證:BB'=DD′.
(2)若點(diǎn)A與A′不重合,M是A'C'上一點(diǎn),當(dāng)MA′=MA時(shí),連接BM和A'C,BM和A'C所在直線相交于點(diǎn)P;
①如圖2,當(dāng)∠BAD=∠B'A'D'=90°時(shí),請(qǐng)求出線段BM和線段A'C的數(shù)量關(guān)系及∠BPC的度數(shù);
②如圖3,當(dāng)∠BAD=∠BA'D'=60°時(shí),請(qǐng)直接寫出線段BM和線段A'C的數(shù)量關(guān)系及∠BPC的度數(shù).