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Срочно решить задачу по геометрии!
ABCDA1B1C1D1-куб, ребро которого 8см. Постройте сечение куба плоскостью, проходящий через точки С,B1 и N, где N-середина ребра AD. Вычислите периметр сечения.
Ответы 1
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При условии, что 4-я точка пересечения будет А1, результат будет: CN=AN=4\/5; D1C=8\/2; AD=8; P=2*4\/5+8\/2+8=8(\/5+\/2+1); При условии, что плоскость проходит через другие стороны результат изменится..
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Автор:
norahvcia - 5 лет назад
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