Question

The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find:
(i) its inner curved surface area.
(ii) the cost of plastering this curved surface at the rate of 40 per m².

Answer 1

Answer:

inner curved surface area is $110m^{2}$

cost of plastering is 4400Rs

Step-by-step explanation:

Given:-Diameter=3.5m

           height=10m

curved surface area of cylinder = $2\pirh$

where r is radius and h is the height

radius=$\frac{d}{2}$ where d is diametre

radius=$\frac{3.5}{2}$

curved surface area=$2\pi\frac{3.5}{2}10$

curved surface area=$2\frac{22}{7}\frac{3.5}{2}10$

curved surface area=$110m^{2}$

cost of plastering=40×110=4400

Answer 2

Answers is in the above photo

hope it helps you