Question

The diameter of the base of the cone is 10 a cm and 12cm what is approximate curved surface area of the cone

Answer 1

the formula is
$\pi \: rl \: to \: for \: csa \: ofcone \\ they \: give \: h \: and \: r \: know \: we \: want \: \\ to \: find \: l \: finding \: of \: l \: is \: the \: formula \ \\ \sqrt{r {}^{2} } + {h}^{2} \: \: \: \: \: \sqrt{ {10}^{2} } - {20}^{2} \\ \sqrt{100} - 400 \ \: \: \: \sqrt{ - 300} \\ 22 \div 7 \times 10 \times 20 \\ 3.14 \times 200 \\ 628$