Ответ:
6 см
PE = 2(BC * AD) / (BC + AD) = 2 * (12 * 4) / (12 + 4) = 2 * 48 / 16 = 6 см
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Ответ:
6 см
PE = 2(BC * AD) / (BC + AD) = 2 * (12 * 4) / (12 + 4) = 2 * 48 / 16 = 6 см