diameter
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A diameter is a straight line that passes through the center of a circle and connects two points on the circle's edge. It's useful because it's the longest distance across a circle and helps define the circle's size—the diameter is exactly twice the radius (the distance from the center to the edge).
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In geometry, a diameter of a circle is any straight line segment that passes through the centre of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle. Both definitions are also valid for the diameter of a sphere.