Предмет: Алгебра, автор: arinapuzeeva

чему равны периметр и площадь прямоугольник со сторонами 3 см и 31мм? Запиши ответ в указанных единицах. Р=.... мм; S=.... мм2.

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Автор ответа: Amigo3

Ответ: сначала обе длины приводим к единым единицам, например, к миллиметрам, 3 см=30мм. Периметр равен сумме длин всех четырёх сторон прямоугольника, площадь равна произведению длин сторон. Тогда Р=2*(30+31)=2*61=122 мм. S=30*31=930 мм^2.

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