class 9 th maths 13.2 प्रश्नावली
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=Diameter of the cylinder= 140 cm
Radius of the cylinder (r) = d/2= 140/2= 70cm =0.70
Height of the cylinder (h)= 1 m
2πr (h+r) = (2× 22 × 0.10. × 1.70)m2
= 7.48 m2
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