[HÌNH HỌC 7] HAI GÓC ĐỐI ĐỈNH

I. ĐỊNH NGHĨA 

$\widehat{O_1 }$ và $\widehat{O_3 }$ là hai góc đối đỉnh

$\widehat{O_2 }$ và $\widehat{O_4 }$ là hai góc đối đỉnh

Định nghĩa: Hai góc đối đỉnh là hai góc mà mỗi cạnh của góc
này là tia đối của một cạnh của góc kia.

II. TÍNH CHẤT 

Hai góc đối đỉnh thì bằng nhau.

Ví dụ: $\widehat{O_1 }$ và $\widehat{O_3 }$ đối đỉnh $ \Rightarrow \widehat{O_1 } = \widehat{O_3 }$

           $\widehat{O_2 }$ và $\widehat{O_4 }$ đối đỉnh $ \Rightarrow \widehat{O_2 } = \widehat{O_4 }$

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