CHO TAM GIÁC ĐỀU ABC CẠNH A. MỆNH ĐỀ NÀO SAU ĐÂY ĐÚNG

ON TAP CHUONG 1 TRAC NGHIEM

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Đáp án tham khảo

Câu 13. Cho tam giác đều ABC cạnh a. Mệnh đề nào sau đây đúng:

A.

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_{AB BC}

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_

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_

₀

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B.

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^

_{AB BC CA}

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_

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^

_

_

₀

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C.

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_{AB BC}

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_

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_

₂

_CA

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D.

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^{AB BC}

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^

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^

^

^a

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