Question

In a building there are 24 cylindercal pillars the radias is 28cm and height is 4cm of each pillar find the total cost of painting the all pillars at the rate of rs15m²

Answer 1

mujhe brainliest dena plzz
Radius of cylinderical pillars 
= r = 28cm =0.28m
height ,h=4m
curved surface area of a cylinder =2πrh
curved surface area of a pillar= 2×22\6×0.28×4=7.04metresq.
Curved surface area of 24 such pillars = 7.04×24=168.96metresq.
cost of cementing an area of 1metresq. =Rs8
so,cost of painting 1689.6metresq.=168.96×8=Rs1,351.68