The area enclosed by a chord is equal to the area enclosed by a segment minus the area enclosed by the triangle with the same corners as the segment. To visualise it, draw a circle and put a chord on it. Label the chord AB and the centre of the circle C. The area of sector AB equal to the area of sector ABC minus the area of triangle ABC.
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The line connecting the points is called a chord; the part of the perimeter of the circle enclosed is called an arc; the area between an arc and the chord is called a circular segment.
A chord of which the circle's diameter is the largest chord
A chord of a circle that contains the center of the circle is called the diameter.
A chord is any line segment that connect two points of a circle. If a chord passes through the center of the circle it is called the DIAMETER of the circle. The diameter of any circle is the longest chord of that circle as well.
A piece of the circumference of a circle is called an arc A piece of the area of a circle bounded by an arc and two radii is called A sector. A piece of the area of a circle bounded by an arc and a chord is called a segment