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P = a * b
P = 48 cm²
a = 8 cm
P = a * b
48 cm² = 8 cm * b /8 cm
b = 6 cm
B)
P = a * b
P = 60 dm²
a = 12 dm
P = a * b
60 dm² = 12 dm * b /12dm
b = 5 dm
C)
P = a * b
P = 147m²
a = 7m
P = a * b
147m² = 7m * b /7m
b = 21 m
D)
P = a * b
P = 3300 cm²
a = 11 dm = 110cm
P = a * b
3300cm² = 110cm * b /110cm
b = 30 cm = 3dm