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r (jari-jari) = 8 cm
L = x r²
L = 3,14 x 8²
L = 3,14 x 64
L = 200,96 cm²
16 = 1/2 r
16/1/2 = r
8 = r
jari-jari = 8
luas
phi x r^2
22/7 x 8^2
22/7 x 16
36