Question

find the lateral surface area of a cylinder pillar with radius 14cm height 5m if the cost of white washing is ₹5per square metres find the cost of white washing 8 such pillars​

Answer 1

Explanation:

CSA of cylinder = 2πrh

= 2 × 22/7×14×5

= 440cm²

cost of 1cm² = 5rs

cost of 440cm² = 5 × 440

= 2200rs

Answer 2

Lateral surface Area, LSA =

$= > lsa = 2\pi \: rh$

$= > lsa \: = 2 \times \frac{22}{7} \times \frac{14}{100} \times 5$

$= > lsa \: = 4.4 {m}^{2}$

Rate of white washing = Rs 5 per square metre

Cost of white washing 8 pillars,

$= > cost =8 \times 5 \times 4.4$

$= > cost \: = rs \: 176$

Hence, cost of white washing eight pillars is Rs 176.

Hope this answer helps you ^_^ !