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d=8
O=8π=8*3,14=25,12
25,12 + 20 = 45,12
r=4 cm
l=2πr
l=2*4*π
l=8*3,14
l=25,12
25,12+20=45,12 cm
d= 8 cm , r= 4cm
8πcm + 20cm = 8 * 3,14 + 20 = 25,12 + 20 = 45,12 (cm)