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sa2002na123456789
@sa2002na123456789
July 2022
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Помогите номер 7,8 пожалуйста
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Kазак
Пусть меньшее основание x, проекция наклонной боковой стороны на основание z
наклоная боковая сторона
h/z = tg(30°) = 1/√3
z = h√3 = 30√3*√3 = 90
Площадь
s = 1/2(x+x+z)*h = 1/2(2x+90)*30√3 = 3150√3
2x+90 = 2*105
2x = 210-90 = 120
x = 60
--------
s = π*r²*α/(2π)
α=2/3π
s = π*21²*1/3 = π*21*7 = 147π
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Answers & Comments
наклоная боковая сторона
h/z = tg(30°) = 1/√3
z = h√3 = 30√3*√3 = 90
Площадь
s = 1/2(x+x+z)*h = 1/2(2x+90)*30√3 = 3150√3
2x+90 = 2*105
2x = 210-90 = 120
x = 60
--------
s = π*r²*α/(2π)
α=2/3π
s = π*21²*1/3 = π*21*7 = 147π