Question

Find the cost of painting 25 cylindrical pillars of height 3.5 m at 45 per square metre if the
diameter of each pillar is 0.7 m.​

Answer 1

3858.75 rupees

Step-by-step explanation:

radius of cylinder (r) = 0.7 m

height of cylinder (h) = 3.5 m

Total surface area of  one cylinder =  $2\pi r(h+r)$

                                                           = $2*22/7 *0.7(3.5 + 0.7)$

                                                           = 3.43 sq. meter

Total surface area of  25 cylinder =  $25 * 3.43 = 85.75$

Cost of painting of 1 square meter = 45 rupee

So Total cost of painting = $45 *85.75 = 3858.75$ rupees

Note: Assuming 45 rupees. If it is in paise then please divide it by 100 to get your answer in rupees.

Answer 2

Answer:

Step-by-step explanations find the cost o of painting 25 cylindrical pillars of hight 3.5m at 45 per square metre if the diameter of the cylinder