At first my friend, you haven't stated of what kind of body are you looking to find the radius.
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That will depend on its height which has not been given but the volume of a cylinder is pi*radius squared*height.
Given a sphere of radius r, Surface area = 4{pi}r2 Volume = (4/3){pi}r3
Density = mass/ volume volume= 4/3(pie)(r^3) ***r= radius in meters** so find volume then divide mass by volume and there you go.
Vol = 4/3*pi*r3 so given the volume, you can calculate the radius. Height of sphere = 2*radius.
The volume of a sphere is 4/3 Pi x radius cubed. So given V you multiply the volume by 3/4 and divide by Pi, then take the cube root of that entire quantity and you have the radius.