A big cantaloupe has a diameter of about 26 inches. How much surface area does its peel cover?
If we know the diameter of the cantaloupe, we can find its radius faster than a Hufflepuff. It's 13 inches. Take that, Cedric Diggory. Now we can use our surface area formula.
SA = 4πr2SA = 4π(13 in)2SA ≈ 2124 in2
That's all it takes.