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7*6= 42 cm2
10*10= 100 cm2
7dm*9dm= 63 dm 2
15m * 20m= 300 m2
a = 7 cm
b = 6 cm
P = 7 * 6 = 42 cm²
2.
a = 10 cm
b = 10 cm
P = 10 * 10 = 100 cm²
3.
a = 7 dm
b = 9 dm
P = 7 * 9 = 63 dm²
4.
a = 15 m
b = 20 m
P = 15 * 20 = 300 m²