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A=pi.r²
A=pi.15² (porque el radio es la mitad del diametro)
A=225pi cm²
P=2pi.r
P=2pi.15
P=15(2)pi=> P=30pi
50 cm:
A=pi.r²
A=pi.25²(porque es la mitad del diametro)
A=625pi cm²
P=2pi.r
P=2pi.25
P=25(2)pi => P=50pi