P = (a + b) * 2
P = 20 см
a = 6 см
b = ? см
(6 + b) * 2 = 20
6 + b = 20 : 2
6 + b = 10
b = 10 - 6
b = 4 см - другая сторона.
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Verified answer
P = (a + b) * 2
P = 20 см
a = 6 см
b = ? см
(6 + b) * 2 = 20
6 + b = 20 : 2
6 + b = 10
b = 10 - 6
b = 4 см - другая сторона.