Question

The inner diameter of a 15m deep circular well is 4.2m. find the cost of plastering its inner covered surface at the rate of 40 per m square take ^22/7​

Answer 1

Answer:

$\huge\colorbox{yellow}{Given\:-}$

• Inner diameter of wall = 4.2 m

• Height of wall = 15 m

$\huge\colorbox{yellow}{To\:Find\:-}$

The cost of plastering the inner covered surface of wall at ₹ 40 per m²

$\huge\colorbox{yellow}{Solution\:-}$

Radius = 2.1 m

$\Large{\boxed{\red{CSA = 2πrh}}}$

A. T. Q,

$2 \times \frac{22}{7} \times 2.1 \times 15$

= 198 sq m

Cost of plastering the inner covered surface

$198 \times 40$

$\boxed{\pink{ = > ₹ \: 7920}}$

$\huge\colorbox{yellow}{Thank\:You}$