Odpowiedź:
3dm = 30cm
x + x + (x + 1) + (x + 1) = 30
4x + 2 = 30 /-2
4x = 28 / :4
x = 7 cm
Boki prostokąta: 7cm, 8cm (bo 7cm + 1cm)
P = a * b
P = 7 * 8 = 56cm^2
Szczegółowe wyjaśnienie:
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Odpowiedź:
3dm = 30cm
x + x + (x + 1) + (x + 1) = 30
4x + 2 = 30 /-2
4x = 28 / :4
x = 7 cm
Boki prostokąta: 7cm, 8cm (bo 7cm + 1cm)
P = a * b
P = 7 * 8 = 56cm^2
Szczegółowe wyjaśnienie: