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2.IIr pangkat2 = 3.14 × 20 × 20 = 1.256
3. kelling lingkaran = IIr kuadrat
2IIr = IIr kuadrat
50.24 = 3.14 × r kuadrat
r= 50.24 / 3.14
r = 16
luas lingkaran
IIr kuadrat = 3.14 × 16 × 16 = 803.84 cm kuadrat