Α = 144·pi = pi·r^2----> r^2 = 144
quindi: r = 12 cm
Σ = area segmento circolare =144·pi·(90/360) - 1/2·r^2·SIN(90°)
Σ = (36·pi - 72) cm^2----> Σ = 41.097 cm^2
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