Предмет: Геометрия, автор: svetooo9435

Диагональ квадрата 4 корень из 2 см .Найдите площадь квадрата. СРОЧНО ПОЖАЛУЙСТА ПОМОГИТЕ!!

Ответы

Автор ответа: olga04031984

Ответ:

Объяснение:

1 способ

Пусть x - сторона квадрата.

По Т. Пифагора: x^2 + x^2 = (4 корня из двух)^2

2x^2 = 32

x^2 = 16

x= +-4, - 4 - не удовл.

S=4^2=16

2 способ

S=1/2d^2, где d - диагональ

S=1/2*(4корня из двух)^2

S = 1\2 * 32

S = 16

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