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Ответ дан
tomilev

Ответ:

9

Пошаговое объяснение:

1) P = 2(a + b)

2) a = x

b = x + 4

P = 28

P = 2( x + x + 4)

P = 2(2x + 4)

P = 28

28= 2(2x + 4)

2x + 4 = 28/2= 14

2x = 14-4 = 10

x = 10/2 = 5 - меньшая сторона

3) 5 + 4 = 9 - большая сторона

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