23. Exemplar Exercise Problems VI

1. A solid cone of radius r and height h is placed over a solid cylinder having same base radius and height as that of a cone. The total surface area of the combined solid is $πr[\sqrt{r^2+h^2}]+3r+2h]$. 

 

2. The curved surface area of a frustum of a cone is $π l (r_1 + r)2$, where $l=\sqrt{h^2+(r_1+r_2)^2}$, $r_1$ and $r_2$ are the radii of the two ends of the frustum and h is the vertical height. TrueFalse