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Question:

The formula for finding the total surface area of a cylinder having cone shaped lid at both the ends, will be

πr(l+2r)

πr(2h+r)

2πr(h+l)

2πr(h+2r)

Solution:

Total Surface Area of cylindrical part=2πrh
Surface Area of two cones=πrl+πrl=2πrl
Then, Total Surface Area=2πrh+2πrl=2πr(h+l)