The longest distance across a circle is its diameter and the shortest distance is a minor chord
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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.
radius
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.
The term is "perimeter", and it is the sum of the lengths of the sides. Note that if the object in question is a circle, the perimeter is called the "circumference."
An ellipse.