Question

The slant height and base diameter of a conical tomb are 25 m and 14 m respectively. Find the cost of white-washing its curved surface at the rate of ₹ 210 per 100 m².

`["Assume "pi=22/7]`

Answer 1

Slant height (l) of conical tomb = 25 m

Base radius (r) of tomb = `14/2` = 7 m

Curved surface area of conical tomb = πrl

=`(22/7 xx 7 xx 25)  m^2`

= 550 m²

Cost of white-washing 100 m² area = ₹ 210

Cost of white-washing 550 m² area = `₹((210xx550)/100)`

= ₹ 1155

Therefore, it will cost ₹ 1155 while white-washing such a conical tomb.