Question

a circular well of depth 7m and radius 1.5 m is dug calculate the cost of the cement in the inner surface at the rate of Rs. 50 per metre square

Answer 1

Answer:

Rs. 3650.25

Step-by-step explanation:

Area of well = $2\pi rh + \pi r^{2}$

        ($\pi = 3.14$)

$\pi r (2h+r)$

3.14 *1.5 (2*7 + 1.5 )

4.71 ( 14 + 1.5 )

4.71 * 15.5

73.005 $m^{2}$

Cost = 50 * 73.005

         Rs. 3650.25

Answer 2

The cost of the cement in the inner surface is Rs.3653.55

Step-by-step explanation:

Depth of well = 7 m

Radius of well = 1.5 m

Inner surface area = Curved surface area + one base

Inner surface area =$2 \pi r h + \pi r^2$

Inner surface area =$2 \times \frac{22}{7} \times 1.5 \times 7 + \frac{22}{7} 1.5^2$

Inner surface area =$73.071 m^2$

Cost of cementing 1 sq.m. = Rs.50

Cost of cementing 73.071 sq.m. =$73.071 \times 50=Rs.3653.55$

Hence The cost of the cement in the inner surface is Rs.3653.55

#Learn more:

The diameter of a circular well is 4.5 m and it depth is 7m find the cost of cementing the inner curved surface of the well at the rate of 3.50 per square rupees

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