Question

If the base radius and height of a right circular cone are 3 cm and 4 cm in lengths, then the slant height is

(a) 5 cm
(b) 2 cm
(c) 25 cm
(d) 6 cm

Answer 1

(a) 5 cm



$l=\sqrt{r^2+h^2}=\sqrt{3^2+4^2}=\sqrt{25}=5\mathrm{cm}$