The radius of the base of a conical tent is 8 m and its height is 15 m. What is the cost of the material needed to make it, if it costs Rs.54 per π m² ?

Rs.7344

Slant height of the cone (l) = \(\sqrt{r^2+ h^2}\)  = \(\sqrt{8^2 + 15^2}\) = 17

Curved Surface area of cone = πrl

                                          = π x 8 x 17 m² = 136π m²

⇒ Cost of covering 1π m² = Rs.54

⇒ Cost of covering 136π m² = 54 x 136 = Rs.7344