A área de um círculo, sabendo de diâmetro calculadora online

Calculadora online que o ajudará a encontrar a área de um círculo, sabendo de diâmetro.
Círculo – este geométrica lugar de pontos do plano, a distância a partir de um determinado ponto se chama centro do círculo não excede um determinado número de chamado raio deste círculo, e se o raio é igual a zero então o círculo degenera em um ponto.
O diâmetro é o dobro do raio.

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