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對頂角:一個角的兩邊分別是另一個角的反向延伸線,這兩個角是對頂角兩條直線相交後所得的只有一個公共頂點且兩個角的兩邊互為反向延長線,這樣的兩個角叫做互為對頂角.兩條直線相交,構成兩對對頂角.互為對頂角的兩個角相等.
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