Before 1982 U.S pennies were made of solid copper. As the price of copper rose,the U.S mint switched to a composition that is 97.5% zinc and 2.5% copper. A penny minted after 1982 is 19 mm in diameter and 1.6 mm thick.

Question

Before 1982 U.S pennies were made of solid copper. As the price of copper rose,the U.S mint switched to a composition that is 97.5% zinc and 2.5% copper. A penny minted after 1982 is 19 mm in diameter and 1.6 mm thick.
What is the volume of a penny in mL?

DrBob222 · Answer

volume = pi*r²*h
pi=3.14
r = (19/2) mm and I suggest you change this to cm by dividing by 10 so (18/20) cm radius.
height is 1.6 mm or 0.16 cm.

Using the cm measurements, the volume will be in cubic centimeters, or cc, and that is the same as mL.