How many cubic metres of the earth must be dug out to sink a well which is 20 m deep and has a diameter of 7 metres. if the earth so dug out is spread over a rectangular plot 28m by 11m what is the height of the platform?
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Answer:
2.5 meters
Step-by-step explanation:
diameter = 7 m
radius = 7/2 = 3.5 m
height = 20 m
volume = πr²h
= 22/7×3.5²×20
= 770m³
l= 28 b = 11 h = h
volume of cuboidal platform = l×b×h
= 28×11×h
= 308h m³
volume of cuboid platform = volume of the earth dug out
308h = 770
h = 770÷308 =2.5 m
i hope it helps !!
Answer:
How many cubic metres of the earth must be dug out to sink a well which is 20 m deep and has a diameter of 7 metres. if the earth so dug out is spread over a rectangular plot 28m by 11m what is the height of the platform?