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100 = 3,14 . 2r
2r = 100/3,14
2r = 31,8
r = 31,8/2
r = 15,9 cm
L = π . r²
L = 3,14 . 15,9²
L = 3,14 . 252,81
L = 793,8 cm²
Maaf kalau salah :)