A well is dug whose diameter is 7m and depth 20m find the quantity of earth taken out to construct the well
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aftab172:
class 8
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Diameter of the well = 7m
So, radius of the well = 7 ÷ 2 = 3.5m
Height of the well = depth of the well = 20m
We know that the well is in the shape of a7 cylinder.
So,
Quantity of the Earth taken out = Volume of the well = πr²h
→ 22/7 × 3.5² × 20
→ 22/7 × 12.25 × 20
→ 22/7 × 245 = 770m³
Hence,
Amount of Earth taken out is 770 m³
—×—×—×—×—×—×—×—×—×—×—×—
If the answer is correct do as you wish and if not correct please inform me.
Diameter of the well = 7m
So, radius of the well = 7 ÷ 2 = 3.5m
Height of the well = depth of the well = 20m
We know that the well is in the shape of a7 cylinder.
So,
Quantity of the Earth taken out = Volume of the well = πr²h
→ 22/7 × 3.5² × 20
→ 22/7 × 12.25 × 20
→ 22/7 × 245 = 770m³
Hence,
Amount of Earth taken out is 770 m³
—×—×—×—×—×—×—×—×—×—×—×—
If the answer is correct do as you wish and if not correct please inform me.
answer is 770 m cube
I have done the corrections.
I forgot to square 3.5
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