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220 = 2(22/7) r
r = 220/(44/7)
r= 35
jadi L = phi r^2
L= 22/7 (35^2)
L = 3850 cm2
220 = 2 . 22/7 .r
70 = 2 r ( perkalian silang)
r = 70 : 2
r = 35
>> L = πr²
= 22/7 . 35 . 35
= 110 . 35 = 3850 cm²