Предмет: Алгебра, автор: fjoifhwiw010

помогите пожалуйста!!!!!!
Обчисліть площу ромба, одна з діагоналей якого дорівнює 16 см, а сторона становить 10 см

Ответы

Автор ответа: ediktsapenko
1

В ромбе диагонали точкой пересечения делятся пополам и взаимно перпендикулярны. Если в ромбе провести диагонали, то они разобьют ромб на 4 равных прямоугольных треугольника.

Тогда рассмотрим один из таких треугольников.

В нем известна сторона ромба- это будет гипотенуза для ∆, и один из катетов, это половина первой диагонали ромба, второй катет не известен, но он половина второй диагонали ромба.

По теореме Пифагора:

102=(16/2) 2+x2

100=642+x2

X2=100-64=36; х=6см, тогда вторая диагональ равна 6*2=12 см.

S=0,5*d1*d2=0,5*16*12=96 см²


fjoifhwiw010: откуда 0,5 взялось?
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