Question

Question 7. The inner diameter of a circular well is 3.5 m. It is 10 m
deep. Find
(i) its inner curved surface area.
(i) the cost of plastering this curved surface at the rate of rupees 40 per m.​

Answer 1

Answer:

(I)2R=3.5M

R=3.5/2M

R=1.75M

H=10M

THEREFORE THE INNER CURVED SURFACE AREA OF THE CIRCULAR WELL=2πRH

2×22/7×1.75×10=110M²

(II) COST OF PLASTERING OF THE CURVED SURFACE AREA 40 RS PER M

110×40=4400