Explicación paso a paso:
p = 2π•r
a = π•r²
42.31 = 2π•r
despejamos r (radio)
r = 42.31/(2π)
r = 6.73384
calculamos el área
a = π•(6.73384)²
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Explicación paso a paso:
p = 2π•r
a = π•r²
42.31 = 2π•r
despejamos r (radio)
r = 42.31/(2π)
r = 6.73384
calculamos el área
a = π•(6.73384)²
a = 142.4545045cm²