1
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Góc A là góc ngoài của đường tròn O.

2
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Vậy mình có đường tròn A ở đây.

3
00:00:07,950 --> 00:00:11,360
Mình gọi đây là một góc ngoại tiếp

4
00:00:11,360 --> 00:00:13,550
nghĩa là hai cạnh lập thành góc này

5
00:00:13,550 --> 00:00:15,820
là hai đường tiếp tuyến của đường tròn tâm O.

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