d = 2r ⇒ 21 = 2r ⇒ 21:2 = 10,5 = r
L = πr² ⇒ 3,14.10,5² = 3,14.110,25 = 346,185 cm²
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d = 2r ⇒ 21 = 2r ⇒ 21:2 = 10,5 = r
L = πr² ⇒ 3,14.10,5² = 3,14.110,25 = 346,185 cm²