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Observation

1. Top and bottom of cylinders are circles.
Therefore Area of 2 circles = , where r is the radius of base circle of cylinder
2. Length of rectangle = circumference of base of cylinder = r
3. Breadth of rectangle = height = h
4. Area of rectangle = x h = curved surface area of cylinder
5. Total surface area of cylinder = +
=
6. Result
Curved surface area of a cylinder =
Total surface area of a cylinder = (h+r)
7. Learning Outcome
This activity’ clears the concept of curved surface area (lateral surface area) and
total surface area of a cylinder.

Activity Time
Calculate the total surface area in terms of radius, where ‘tf represents the diameter of the