Question

The slant height and base diameter of a conical tomb are 25 m and 14 m. find the cost of whitewashing at the rate of 210 rupees per 100 m square.
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Answer 1

see the attachment you will know about this question

Answer 2

Given:

• Slant height of the conical tomb is 25m.
• Diameter of the conical tomb is 14m.

Therefore, radius of the conical tomb is 14/2 = 7m

$\huge \mathtt{ \purple{SOLUTION:-}}$

Curved surface area of the tomb = πrl

$\large \implies{ \frac{22}{7} \times 7 \times 25 {m}^{2} }$

$\large \implies{22 \times 1 \times 25 {m}^{2} }$

$\large \implies{ \bold{550 {m}^{2} }}$

Cost of whitewashing 100 m^2 area = Rs 210

Cost of whitewashing 550 m^2 area

$\large{ \implies{ \frac{1}{100} \times 210 \times 550}}$

$\large \implies{ \bold{Rs \: 1155}}$

Therefore,

The cost of whitewashing the tomb is Rs 1155.