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a) luas = x
616 = x
= 616 : = 616 x = = 196
r = = 14 cm
b)keliling = 2 x x r
keliling = 2 x x 14 = 88 cm
616 = 22/7 x r^2
196 = r^2
r = 14
Keliling = 2 x 22/7 x 14
= 88