To find the correct volume of the cone, we just need to input the measurements into their respective places in the formula and solve. Your work should look similar to the following:
V = πr²(h/3)
V = π(4)²(6/3)
V = π(16)(6/3)
V = π(16)(2)
V = π(32)
V = 100.48 cm³
(You can use the work shown above to find Joan's mistake in her work.)