Question

find the coast of painting 18 cylindrical, pillars of building at Rs 6 per Sq.m, if the diameter and height of each pillar is 42 cm and 6m respectively. ​

Answer 1

Step-by-step explanation:

Given length or height of pillar =3.5m

Radius of each pillar =36cm

CSA of pillar =2πrh=2π×0.36×3.5

CSA=7.91m

2

Now total area to be painted =7.91×20

Total Area =158.20m

2

Cost of painting =158.20×3=474.60.