ответ: 64 пи
объяснение:
) тк в осевом сечении конуса у нас лежит равнобедренный треугольник и угол при вершине 90 градусов то значит что это прямоугольный треугольник с двумя равными катетами (образующими) по 4 дм значит гипотенуза , которая равна двум радиусам , будет равна по теореме пифагора 4 корень из 2; а равна она двум радиусам потому что высота проведённая из вершины прямого угла треугольника на основание конуса равна медиане и попадает она в центр окружности основания, получается что радиус равен 2 корень из 2;
2) площадь боковой равна пи*радиус*образующую=пи*2 корень из 2*4=8 корень из двух *пи;
3) объём равен площади основания на высоту;
площадь основания пи*радиус в квадрате а высота из осевого сечения по теореме пифагора можно найти: корень из( 16 - 8)= корень из 8 = два корень из двух ;
объём равен пи*8*8=64*пи
извини что без рисунка возможно здесь даже есть ошибки я так представил
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