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