Question

In a building there are 28 cylindrical pillars with each having a radius 32 cm and height 8 m. Find the cost of painting the curved surface area of all pillars at the rate of Rs. 12 per meter square.​

Answer 1

Answer:

Step-by-step explanation:

C.S.A. of cylindrical =2πrh

⇒ C.S.A. of are pillar = 2× $\frac{22}{7}$ ×32×8 = 1,607.68 cm²  

⇒ C.S.A. of 28 pillars =  1607.68 × 28 = 45015.04 cm²

   45015.04 cm² in meter square = 450.15 m²

⇒ Total cost Rs.12×450.1504 = Rs.5,401.8