A few days ago
Find the radius of the sphere described. help?
Find the radius of the sphere descreibed. 3.14 is supposed to be the symbol for pie. Volume = 25 (3.14). Surface Area = 144 (3.14).
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A few days ago
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The volume v of a sphere of radius r is
v = (4/3)pi r^3.
Therefore:
r^3 = v / (4/3)pi
= 3v / 4pi
r = (3v / 4pi)^(1/3)
If v = 25pi, then:
r = (75 / 4)^(1/3)
r = 2.657.
The surface area s of a sphere of radius r is:
s = 4 pi r^2.
Therefore:
r^2 = s / 4pi
r = sqrt(s / 4pi)
r = sqrt(144 pi / 4pi)
r = sqrt(144 / 4)
r = 12 / 2
r = 6.
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