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数学
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如图，AC和BD相交于点O，且AB∥DC，OA=OB．
求证：OC=OD．
人气：476 ℃ 时间：2019-09-13 19:27:15
解答
证明：∵AO=BO，
∴∠A=∠B，
∵DC∥AB，
∴∠D=∠B，∠C=∠A，
∴∠C=∠D，
∴CO=DO．
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如图，AC和BD相交于点O，且AB∥DC，OC=OD，求证：OA=OB．
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