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ivan1и2в3а4н5
ivan1и2в3а4н5
26.03.2023 00:14 •  Геометрия

В треугольнике АВС, ∠C=90° построены медианы AD=42 см и CE=32 см. Гипотенуза … = …. cм

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Ответ:
JonHenryEdem1
JonHenryEdem1
26.03.2023

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Ответ:
VF85
VF85
26.03.2023
Раз периметр ромба равен 16 см, то каждая его сторона равна 16:4=4 см. Точкой пересечения диагоналей получаем прямоугольный треугольник, в котором гипотенузой является сторона ромба, равная 4 см, а также катет, равный половине данной длины нашей диагонали, т.е. один из катетов равен 3√4:2=6:2=3.
По теореме Пифагора находим второй катет: 4^2-3^2=7. Второй катет равен √7.
Тут по таблице Брадиса я только примерно могу назвать градусную меру углов.
Возьмём синус угла, напротив которого лежит половина нашей диагонали. Он будет равен 3:4=0,75. Градусная мера угла(примерно!) равна 49 градусов.
Тогда градусная мера другого угла примерно будет равна 180-90-49=41 градус.
Т.к. проведённые диагонали ромба являются и биссектрисами его углов, то градусная мера двух углов будет равна 98-ми градусам(лежащим напротив друг друга), а градусная мера других двух углов будет равна 82 градусам.
Чтобы удостовериться, что данные расчёты в теории правильны, сложим эти углы(должно получиться 360 градусов)=82^2+98^2=360.
ответ:Градусная мера острых углов ромба равна 82-ум градусам, а тупых 98-ми.
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