I don't believe there is a way to find the mass of an object knowing only the diameter of the object. If you had the volume, or some other measurements sure. the best bet would be just to weigh it, or find the volume using the principles of displacement.
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Why the mass? Volume sphere = 4/3*pi*r^3 r = 1.5 cm/2 = 0.75 cm V = 4/3* pi *(0.75)^3 = 1.8 cubic centimeters
3:5 lol
The equation for determining the circumference of a circle is circumference = pi x diameter. So if the diameter is 5, then the circumference is pi * 5 = 15.71
Assuming a diameter of 5 inches.The area of this circle is: 19.63
it is half the diameter e.g 10cm diameter = 5 cm radius