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1256 = 3.14*r^2
r^2 = 1256/3.14
r^2 = 400
r = √400, r= 20 cm
l. selimut = 2Πrt
l. selimut = 2*3.14*20*40
l.selimut = 5024 cm2
1256 = 3,14 ×r²
1256÷3,14 =r²
400 = r²
√400 =r
20 =r
luas selimut tabung = 2πrt
= 2×3,14×20×40
= 5024 cm