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luas lingkaran = 440
luas lungkaran = phi . r . r
440 = 22/7 . r^2
22/7r^2 = 440
r^2 = 440 . 7/22
r^2 = 140
r = akar 140
r = 11,83
b.
luas lingkaran = 616
luas lungkaran = phi . r . r
616 = 22/7 . r^2
22/7r^2 = 616
r^2 = 616 . 7/22
r^2 = 196
r = akar 196
r = 14