Anyone can do this maths
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Given that height of cone h = 21cm.
Given that slant height of cone l = 28cm.
We know that l^2 = h^2 + r^2
28^2 = 21^2 + r^2
784 = 441 + r^2
343 = r^2
r = 18.52cm.
We know that volume of the cone = 1/3pir^2h
= 1/3 * 22/7 * (18.52)^2 * 21
= 7545.7
= 7546cm^3.
Hope this helps!
Given that slant height of cone l = 28cm.
We know that l^2 = h^2 + r^2
28^2 = 21^2 + r^2
784 = 441 + r^2
343 = r^2
r = 18.52cm.
We know that volume of the cone = 1/3pir^2h
= 1/3 * 22/7 * (18.52)^2 * 21
= 7545.7
= 7546cm^3.
Hope this helps!
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