This question is poorly worded: depending on one's definition, a circle has only one side, since a circle lacks angles (or, depending on one's definition, has an infinite number of angles) to differentiate one 'side' from another. Presumably, the person asking meant distance between two points on a circle.
A straight line between any two points of a circle is called a chord. A chord (or the length of a chord) which passes through the exact center of the circle is called a diameter, which is the longest-length chord possible for a circle. A half-diameter is called a radius, which would be the distance between the exact center of circle and the circle itself.
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The longest distance across a circle is its diameter and the shortest distance is a minor chord
The area of a trapezium (trapezoid) is the product of: A: the perpendicular distance between the parallel sides b: half the sum of the lengths of the other two sides. The inscribed circle is irrelevant.
On the circle, an arc. Cutting across the circle, a chord.
In plane geometry, the shortest distance between two points is a line. In spherical geometry, the shortest distance between two points is a segment of a great circle. The distance between one point and another is known as the displacement.
In plane geometry, the shortest distance between two points is a line. In spherical geometry, the shortest distance between two points is a segment of a great circle. The distance between one point and another is known as the displacement.