Question

What will be the labour cost of digging a well of radius 3.5 m and height 10 at the rate of ₹60 per cubic metre???

Answer 1

Area of the circle formed by the well is Given by πr²

where 'r' is the radius of the circle formed by the well.

Given that the radius of well = 3.5 m

⇒ Area of the circle formed by the well = (22/7) × 3.5 × 3.5

⇒ 22 × 0.5 × 3.5 = 38.5 m²

Volume of the digged well is given by : Area of well × height of the well

Given that the height of the well as 10m

Volume of the digged well = 38.5 × 10 = 385 m³

Given that the rate per one cubic meter as 60 Rs/-

The labour cost for digged well is 385 × 60 = 23100 Rs/-

Answer 2

Hi prachi. Good morning.

Here is your answer

$r = 3.5 \: m \\ \pi = \frac{22}{7} \\ h = 10 \: m \\ so \: volume \: ofthe \: well \\ = \pi {r}^{2} h \\ = \frac{22}{7} \times {3.5}^{2} \times 10 \\ \ = \frac{22}{7} \times 3.5 \times 3.5 \times 10 \\ = 22 \times 0.5 \times 3.5 \times 10 \\ = 385 {m}^{3} \\ now \: total \: cost \: =Rs (385 \times 60) \\ =Rs 23100$
This is your answer. plz mark as brainliest. plz