Question

Pleaseeee help me in this one please give me step by step answer

Answer 1

Step-by-step explanation:

Given h =15 m

r = 3 m

If the silo is to be painted then we need to find the surface area.

Total surface area of silo = C.S.A. of cylinder + area of base cylinder + C.S.A. of hemisphere

$2\pi \: rh \: + \: \pi \: {r}^{2} + 2\pi \: {r}^{2} \\ = 2 \times \frac{22}{7} \times 3 \times 15 + \frac{22}{7} \times {3}^{2} + 2 \times \frac{22}{7} \times {3}^{2} \\ = \frac{1980}{7} + \frac{198}{7} + \frac{396}{7} \\ = \frac{2574}{7} \\ = 367.71 {m}^{2} = 368 {m}^{2} \\ 80 {m}^{2} = 1 \: can \: \\ = 368 {m}^{2} = \frac{368}{80} cans \\ = 4.6 \\ = 5$

Therefore required no. is 5..

Hope it helps mate