mayank made a bird bath for his garden in the shape of a cylinder with a hemisperical depression at one end. the height of the cylinder is is 1.45m and its radius is 30 cm. find the TSA of the bird bath.(take pi as 22/7) pls refer to pg 244 of ncert txt bk example 4) sir can u plz explain why we don't include the base of the cylinder for the TSA?

Asked by  | 27th Feb, 2013, 11:51: AM

Expert Answer:

Total Surface area of any object refers to what you can see on the outside. If you will see here, the top of the cylinder is open (since its a bird bath) and hence, its surface area need not be taken into account whereas on the other hand, at the other end we have a hemispherical depression and hence, we don't need to account for the area of base of the cylinder, but instead need to consider only the CSA of the hemisphere. 

Answered by  | 28th Feb, 2013, 04:10: AM

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