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Доказательство

Доказательство. 1. Рассмотрим BMN и BAC. AM = MB ( M – середина AB ), MB = AB. BAC. BMN. BN = NC ( N – середина BC), BN = BC. MN = AC. MN || AC. 1 =. 2. B. 1. N. M. 2. C. A. B - общий. Ч.Т.Д.

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Доказательство

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  1. Доказательство 1. Рассмотрим BMN и BAC AM = MB ( M – середина AB), MB = AB BAC BMN BN = NC ( N – середина BC), BN = BC MN = AC MN || AC 1 = 2 B 1 N M 2 C A B - общий Ч.Т.Д

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