Question

Solve this please where we have to take π as 3.14

Answer 1

Step-by-step explanation:

$\:first \: we \: need \: to \: take \: salant \: height(l) = \sqrt{r} {}^{2} +h {}^{2} \\ = > \sqrt{2.5} {}^{2} + 6 {}^{2} \\ = > 6.5cm \\ the \: area \: to \: be \: painted \: orange \: = \\ curved \: surface \: are \: of \: cone + base \: of \: cone \: - base \: area \: of \: cylinder \\ = > \pi \: rl \: + \pi \: r {}^{2} - \pi \: r {}^{2} \\ = > \pi \: (2.5 \times 6.5) )+ (2.5) {}^{2} - (1.5) {}^{2} \\ = > \pi(20.25) \\ = > 3.14 \times 20.25 \\ = > 63.585cm {}^{2} \\ \\ the \: area \: to \: be \: painted \: yellow = \\ curved \: surface \: area \: of \: cylinder \: + area \: of \: base \: one \: of \: the \: cylinder \: \\ = > 2\pi \: rh +\pi r {}^{2} \\ = > \pi \: r(2h + r) \\ = > (3.14 \times 1.5)(2 \times 20 + 1.5) \\ = > 4.71 \times 41.5 \\ = > 195.465cm {}^{2}$