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Danboy
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August 2021
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Вычислить радиус вписанной и описанной окружности около треугольника со сторонами 13, 14 и 15 см
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isom
Verified answer
Найдем S тре-ка по формуле Герона:
S=√21(21-13)(21-14)(21-15) = √21*8*7*6 = 84
R=авс/4S = (13*14*15)/4*84=65/8=8 1/8
r=2S/(а+в+с) = (84*2)/42=4
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Answers & Comments
Verified answer
Найдем S тре-ка по формуле Герона:S=√21(21-13)(21-14)(21-15) = √21*8*7*6 = 84
R=авс/4S = (13*14*15)/4*84=65/8=8 1/8
r=2S/(а+в+с) = (84*2)/42=4