Question

the Slate height and base diameter of a convenient Tomb is 25 and 14 respectively find the cost of whitewashing is curved surface at a rate of 210 rupees at 100m^ square​

Answer 1

Answer:

Rs.1155

explanation

Slant height of cone l = 25 m

Diameter of cone = 14 m

Radius of cone = \frac{14}{2}=7 m

2

14

=7m

Curved surface area of cone =\pi r lπrl

=\frac{22}{7} \times 7 \times 25

7

22

×7×25

=550 m^2550m

2

Cost of white washing 100 sq.m. = Rs.210

Cost of white washing 1 sq.m. = \frac{210}{100}

100

210

Cost of white washing 550 sq.m. = \frac{210}{100} \times 550

100

210

×550

= 11551155

Hence the cost of white-washing its curved surface at the rate of Rs 210 per 100 sq.m. is Rs.1155

Answer 2

Answer:

Rs.1155

explanation

Slant height of cone l = 25 m

Diameter of cone = 14 m

Radius of cone = \frac{14}{2}=7 m

2

14

=7m

Curved surface area of cone =\pi r lπrl

=\frac{22}{7} \times 7 \times 25

7

22

×7×25

=550 m^2550m

2

Cost of white washing 100 sq.m. = Rs.210

Cost of white washing 1 sq.m. = \frac{210}{100}

100

210

Cost of white washing 550 sq.m. = \frac{210}{100} \times 550

100

210

×550

= 11551155

Hence the cost of white-washing its curved surface at the rate of Rs 210 per 100 sq.m. is Rs.1155

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