Question:If the diameter of a cylinder is `28` cm and its height is `20 cm,`then total surface area is : 

A `2993 cm^2` 
B `2992 cm^2` 
C `2292 cm^2` 
D `2229 cm^2` 

+ Answer
B 

+ Explanation
Total surface area 

`= (2π rh + 2 π r^2) cm^2`

`=(2 xx 22/7 xx 14 xx 20 + 2 xx 22/7 xx 14 xx 14) cm^2`

`= 2992 cm^2.`

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Irin Moni

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