Question

# Find the lateral surface area of the given cylinder whose radius is   7cm and height 18cm . If the height of the cylinder is halved, then find the new lateral surface area.  [3 MARKS]

Solution

## ​Concept : 1.5 Marks Solution1.5 Marks We know that The Lateral surface area of cylinder =2πrh 2π×7×18=792 cm2 When the height is reduced to half then using the same formula for the lateral surface area we have 2π×7×9=396 cm2Mathematics

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