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= 1/2 x 3.14 x 20 x 20
= 1/2 x 314 x 4
= 1/2 x 1256
= 628 cm²
L yang tidak diarsir = 1/2 x
= 1/2 x 3.14 x 10 x 10
= 1/2 x 314
= 157
jadi luasnya = L1 - L2 = 628 - 157 = 471 cm²