如圖,AB是半圓O的直徑,AB=2.射線AM、BN為半圓O的切線.在AM上取一點(diǎn)D,連接BD交半圓于點(diǎn)C,連接AC.過O點(diǎn)作BC的垂線OE,垂足為點(diǎn)E,與BN相交于點(diǎn)F.過D點(diǎn)作半圓O的切線DP,切點(diǎn)為P,與BN相交于點(diǎn)Q.
(1)求證:△ABC∽△OFB;
(2)當(dāng)△ABD與△BFO面積相等時(shí),求BQ的長;
(3)求證:當(dāng)D在AM上移動(dòng)時(shí)(A點(diǎn)除外),點(diǎn)Q始終是線段BF的中點(diǎn).