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Найдите площадь круга,если его диаметр равен:а) 7 см
б)5 см в)14 см даю 99 балов-
Предмет:
Математика -
Автор:
jordan905 - 6 лет назад
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Ответы 1
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площадь круга равна число пи*радиусрадиус=диаметр:2(7÷2=3.5) (5÷2=2.5) (14÷2=7)а)3,14×3,5×3,5=38,465см²б)3,14×2.5×2.5=19,625см²в)3,14×7×7=153,86см²
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Автор:
payton8znv - 6 лет назад
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If you do not use arms or for some time, they become weak, when you start them again, then slowly become strong again. Everybody knows this, and nobody would think of guestioning this fact. Yet there are many people who do not seem to know, that memory works in the same way. When someone says that he has a good memory, he really means that he keeps his memory in practice by exercising it regularly, either consciously or unconsciously. When someone else says that his memory is poor, he really means that he does not give it enough opportunity to become strong. The position is exactly the same as that two people, one of whom exercises his arms and legs by playing tennis, while the other sits in a chair or motor-car all day.
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