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a diameter is the length of a circle at its widest point. It's used in finding the circumference of a circle (the area around) by multiplying pi (3.1415926535897........ it goes on, as its infinite) by the diameter. a radius is half the diameter, or the center of the circle to any point on its circumference. If your still confused, the average diameter of an orange is about 4 inches, give or take.

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Q: What is a diameter and how is it used?
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