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24=a + a + (a + 2cm) + (a + 2cm)
24 - 4= 20
20/4 = 5
a = 5
b = 5 + 2cm
spr. : Ob = 5 + 5 + (5 + 2) + (5 + 2) = 24
P = a * b
P = 5 * 7
P = 35 cm²
To chyba tak.. ;)