3. Two marks example and exercise problems

1. If the total surface area of a cone of radius \(7 \ cm\) is \(704 \ cm^2\), then find its slant height. [Example]

 

Answer:

 

The slant height of the cone \(=\)  \(cm^2\)

 

 

2. The external radius and the length of a hollow wooden log are \(16 \ cm\) and \(13 \ cm\) respectively. If its thickness is \(4 \ cm\) then find its T.S.A. [Exercise]

 

Answer:

 

Total surface area \(=\)  \(cm^2\)