Question

(i) We can deduce the relation 2ttr(r+h) as the surface area of a cylinder in another
way. Imagine cutting up a cylinder as shown below (Fig 11.40).
area = Tr?
2tr
h area = 2trh
h
+
> area = TV
22
Note: We take it to be
7
unless otherwise stated.
Fig 11.40
The lateral (or curved) surface area of a cylinder is 2nrh.
The total surface area of a cylinder = ttr2 + 2trh + tr2
= 21tr2 + 2nrh or 21tr (r + h)​

Answer 1

Step-by-step explanation:

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