How Do You Determine The Circumference Of A Circle?
• If you have a flexible measuring tape or ruler, simply measure around the outside of the circle (for example, a dinner plate or a can). Loading… For a larger circle, you could walk around the outside and count paces, or ride a bicycle around it if you have a bicycle odometer. • If you only have a straight ruler, or if the circle you are interested in isn’t physical, you can calculate the circumference. • If you know the distance from one side of the circle to the other (the diameter) simply multiply that distance by a constant called pi (3.14159) to get the circumference. • If you know the distance from the center of the circle to the side (the radius), that is half the diameter. So multiply that by 2 and then by pi (3.14159) and you will get the circumference. With either method, the answer you get has the same units as you originally used to measure. That is, if you measured the radius in centimeters, your circumference is also in centimeters. If you measured the diameter in mile
