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c) 25π m2
d) 1600π cm2
e) 0.01π dm2
a)p=π2²
p=4π
p=4 × 3,14= 12,56cm²
c) p= π5²
p=3,14 x 2578,5= 78,5 m ²
d) p = 3,14 x 40 ²
p= 5024 cm ²
e) p= 0,5² x 3,14
p= 0,785 dm ²