Question

The height of a conical tent is 9m and the radius of its base is 12 m find the area of the 10th

Answer 1

$\bold{given : } \\ \\ dimensions \: of \: conical \: tent : \\ \\ \bold{height :} \\ \\ 9 \: m \: \\ \\\bold{ radius :} \\ \\ 12 \: m \: \\ \\ \\ \\\bold {to \: find : } \\ \\ the \: area \: of \: conical \: tent \: \\ \\ \\ \\ \\\bold{ slant \: height : \: ( \: l \: ) \: } \\ \\ \sqrt{ {r}^{2} + {h}^{2} } \\ \\ \sqrt{ {12}^{2} + {9}^{2} } \\ \\ \sqrt{144 + 81 } \\ \\ \sqrt{225} \\ \\\bold {15 \: m \: }\\ \\ \\ \\ \bold {area \: of \: cone : } \\ \\ { \pi \times r(r \: + l \: ) }\\ \\ {3.14 \times 12 \times (12 + 15) }\\ \\ {3.14\times 12 \times 27}\\ \\ \bold{1017.36 \: {m}^{2} }$