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Hi! Welcome to Math Antics. In our last video, we learned about circles and we learned about a special ratio called Pi. In this video, were going to learn how we can use that ratio to calculate the circumference and the area of any circle. The formulas that we use to calculate circumference and area are so important that you should really memorize them. To help you do that, were going to look at them side-by-side. That will help you see their similarities and their differences so you dont get them mixed up. The formula for finding the circumference is: Circumference equals Pi times diameter. And just like most formulas, we use abbreviation: C for circumference and d for diameter. Thats a pretty simple formula. It tells us that if we know the diameter of a circle, all we have to do is multiply that diameter times the number Pi and well get the circumference. Well try that formula out in a few minutes. But first, lets see the formula for area. The formula for finding the are