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d=K: π
d=88 : 22/7
d=88×7/22
d=28 cm
L=¼πd²
L=¼×22/7×28×28
L=22×28
L=616 cm²
88 = 2 x 22/7 x r
88 = 44/7 x r
r = 88 ÷ 44/7
r = 88 x 7/44
r = 616/44
r = 14
luas lingkaran = π x r x r
= 22/7 x 14 x 14
= 616
jadi luas lingkaran = 616