Just insert the radius into the formula for the volume a sphere, and do the calculations. The formula is:
V = (4/3) pi radius3
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The surface area of a sphere with a radius of 15 units is 2,827 units2
The formula for the volume of a sphere is (4/3) * pi * (r * r * r), where r represents the radius.The radius is half the diameter so the radius in this case is 7.5 cm.So, using the formula, the volume of a metal ball with the diameter of 15 cm is...1767.14587 cubic cm
The volume is 1,900 units3
15 units (to 2 dp)
Volume = 1/3*pi*72*15 = 245pi cubic m