题目内容
（本小题满分7分）如图（6），在等腰梯形
中，
，
，
是
的中点，连接.
、
。求证：
.
中，，，是的中点，连接.、。求证：.证明：∵四边形是等腰梯形 ∴
····························· （2分）
又是的中点
∴
····················································································· （2分）
又
∴
．········································································ （2分）
∴．·················································································· （1分）
是等腰梯形 ∴····························· （2分）又
是的中点∴
····················································································· （2分）又
∴
．········································································ （2分）∴
．·················································································· （1分）略
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