Find the diameter of a circle whose circumference is 21.98 cm?

Oh, dude, you want the diameter of a circle with a circumference of 21.98 cm? Alright, so the formula for circumference is C = πd, and you're given C = 21.98 cm. Just plug in the numbers and solve for d. So, the diameter of the circle would be approximately 7 cm. Easy peasy, lemon squeezy!