The Curved Surface Area $(CSA)$ of a frustum of a cone is given by:

$A$ cylinder is closed at both the ends by $28 \, cm$ high cones. The radius and the height of the cylinder are $21 \, cm$ and $50 \, cm$ respectively. Find the total surface area of the article in $cm^2$.

$A$ wooden toy rocket is in the shape of a cone mounted on a cylinder, as shown in the figure. The height of the entire rocket is $26\, cm,$ while the height of the conical part is $6\, cm.$ The base of the conical portion has a diameter of $5\, cm,$ while the base diameter of the cylindrical portion is $3\, cm.$ If the conical portion is to be painted orange and the cylindrical portion yellow, find the area of the rocket painted with each of these colours. (in $cm^2$) (Take $\pi=3.14$)

$A$ plumbline (sahul) is the combination of (see figure):

$A$ shuttlecock used for playing badminton has the shape of the combination of

The $CSA$ (Curved Surface Area) of a cylinder is equal to $\ldots \ldots \ldots$