12x2=24
36-24=12
12:2=6
12x6=72
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a = 12 cm
b = ?
O = 2a + 2b
2*12 cm + 2b = 36 cm
24 cm + 2b = 36 cm
2b = 36 cm - 24 cm
2b= 12 cm
b= 12 cm : 2
b= 6 cm
P = a*b
P = 12 cm * 6 cm
P= 72 cm2
Odp. Pole tego prostokąta wynosi 72 cm2.
12x2=24
36-24=12
12:2=6
12x6=72