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L lingkaran = (16 x 28) - 334,96 = 448 - 334,96 = 113,04
113,04 = 3,14 x r²
36 = r²
6 cm = r
(28 x 16) - 334,96 = (3,14 x r²)
448 - 334,96 = 3,14 x r²
113,04 = 3,14 x r²
36 = r²
r = 6 cm