se "16x cm" na verdade for "16π cm²".
A = πr²
16π = πr²
16π/π = r²
16 = r²
√16 = r
4 = r
r = 4 cm
D = 2.r (D = diâmetro)
D = 2.4
D = 8 cm.
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se "16x cm" na verdade for "16π cm²".
A = πr²
16π = πr²
16π/π = r²
16 = r²
√16 = r
4 = r
r = 4 cm
D = 2.r (D = diâmetro)
D = 2.4
D = 8 cm.