(a)- A well who's diameter is 7cm has been dugged 225m deep.find quantity of soil dug out.
(b)- find the cost of plastering the surface of well at the rate of 100per meter square
mysticd:
i think diameter is in meters, plz check
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r = 7/2 cm = 350cm
h = 225 m = 22500 cm
l^2 = r^2+h^2
l = (3.5)^2+(225)^2
l = 22502 cm
(a)
The quantity of soil dug out= volume of well
= πr^2h
= 22×3.5×3.5×22500/7
= 866250 cm^3
(b)
The cost of plastering
= 100×πrl
= 100×22×0.035×225.02/7
= Rs. 2475.22
h = 225 m = 22500 cm
l^2 = r^2+h^2
l = (3.5)^2+(225)^2
l = 22502 cm
(a)
The quantity of soil dug out= volume of well
= πr^2h
= 22×3.5×3.5×22500/7
= 866250 cm^3
(b)
The cost of plastering
= 100×πrl
= 100×22×0.035×225.02/7
= Rs. 2475.22
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