D = 10m
R = 5m
A = π5m²
A = 25m²π
a/2 = 25m²π/2
ou ± 39,27m²
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D = 10m
R = 5m
A = πr²
A = π5m²
A = 25m²π
a/2 = 25m²π/2
A/2 = 12,5m²π ← Resposta
ou ± 39,27m²