24.如圖,AB是⊙O的直徑,弦CD⊥AB于點(diǎn)E,已知AB=10,AE=8,點(diǎn)P為AB上任意一點(diǎn),(點(diǎn)P不與A、B重合),連結(jié)CP并延長(zhǎng)與⊙O交于點(diǎn)Q,連QD,PD,AD.
(1)求CD的長(zhǎng).
(2)若CP=PQ,直接寫(xiě)出AP的長(zhǎng).
(3)①若點(diǎn)P在A,E之間(點(diǎn)P不與點(diǎn)E重合),求證:∠ADP=∠ADQ.
②若點(diǎn)P在B,E之間(點(diǎn)P不與點(diǎn)E重合),求∠ADP與∠ADQ滿足的關(guān)系.