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3) l(образующая)=
=5см
S=1\2 x 6 x 4=3 x 4=12см^2
2)сечение которое нужно найти будет основанием конуса с образующей l=17,и высотой равной h=15.Откуда мы можем найти радиус нашей окружности R=
=8
Зная радиус,можно найти площадь окружности S=ПR^2=3.14 x 64=200см^2
3) сечением будет являться прямоугольник ,в котором нам известна уже высота h=6см.
Теперь надо найти другую сторону,чтобы посчитать площадь.S=h x a.
a -эь
то основание равнобедреннего треугольника с сторонами равными радиусу,то есть 5.
Также нам известна высота этого треугольника =4см.Следовательно a=2
=6
S=6 x h=6 x 6=36cм^2.