Question

The slant height and the diameter of a conical tomb are 25 cm and 14 cm respectively. Find the cost of constructing it at the rate of Rs 25 per cubic meter and cost of white washing it's curved surface at Rs 16 per square meter.
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Answer 1

Answer:

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

Radius of the tomb =2Diameter=7m

Hence, CSA of this conical tomb , =722×7×25=550  sq. m.

Cost of white washing the tomb at Rs. 210 per 100m2=100210×550= Rs. 1155

Answer 2

Answer:

Curved surface area of a cone=

$\pi \: r \: l$

where 'r' is the radius of the cone and 'I' is the slant height

Radius =2d =7m Hence, CSA of the conical tomb= 722×7×25= 550 sq.m.

Cost of white washing the tomb at Rs. 210 per 100m2 = 100210× 550= Rs. 11.