Question

the slant height and base diameter of a conical tomb is25m and 14 m respectivley. find the cost of white washing its curved surface at the rate of 210RS. per 100 m^2

Answer 1

Answer:

Slant height l = 25m
Base Diameter = 14m
=> Radius r = Diameter/2 = 14/2 = 7m

C.S.A. = Curved Surface Area

C.S.A. of Conical tomb = πrl
=> 22/7 x 7 x 25
=> 22 x 25
=> 550 m^2

Cost = Area x Rate
Cost = 550/100 x 210
Cost =55 x 21
Cost = Rs. 1155

Therefore, the cost of white washing the curved surface area of conical tomb is Rs.1155.

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Answer 2

$\large\underline\purple{Required \: Answer \: ⤵}$

Curved surface area of a cone = πrl, where r is the radius of the cone and 1 is the slant height.

$Radius \: of \: the \: tomb = \frac{Diameter}{2} = 7 \: </p><p>cm</p><p>$

Hence, CSA of this conical tomb

$= \: \frac{22}{7} \times 7 \times 25 = 550 \: sq.m .$

Cost of white washing the tomb at Rs. 210 per 100 m²

$= \: \frac{210}{100} \times 550 = Rs. \: 1155$