题目内容
（本小题满分8分）
如图，已知在半圆
中，
，
，求
的长度．
如图，已知在半圆
中，，，求的长度．解：
为直径，
，························································ 1分
···················· 2分
．
．························································································ 4分
在
中
且
．······································ 5分
．······································································· 6分
．··························································································· 8分
为直径，，························································ 1分···················· 2分．．························································································ 4分在
中且．······································ 5分．······································································· 6分．··························································································· 8分略
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D．
和⊙
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两点，过点
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