7/25/2019 geometry.docx

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In geometry, a circle is a closed curve formed by a set of pointson a plane that are

the same distance from its center O. That distance is known as the radius of the

circle. In geometry, a circle is a closed curve formed by a set of pointson

a plane that are the same distance from its center O. That distance is known as

the radius of the circle.

 The diameter of a circle is a line segment that passes through the center of the

circle and has its endpoints on the circle. All the diameters of the same circle have

the same length.

A chord is a line segment with both endpoints on the circle. The diameter is a

special chord that passes through the center of the circle. The diameter would be

the longest chord in the circle.

 The radius of the circle is a line segment from the center of the circle to a point on

the circle. The plural of radius is radii.