Предмет: Геометрия, автор: icedasha6

Сторони прямокутника відносяться 5:4, а його площа дорівнює 9680 см2 . Периметр цього прямокутника дорівнює​

Ответы

Автор ответа: sony34970
0

Ответ:

396 см

Объяснение:

a:b=5:4

Нехай k-коефіцієнт пропорційності, тоді а=5k, b=4k

S=a×b

1) 9680=5k×4k

9680=20k²

k²=9680/20

k²=484

k=22

2) a=22×5=110 (см)

3) b=22×4=88 (см)

4) P=2×(a+b)=2×(110+88)=2×198=396 (см)

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