The circumference of a circle is the distance around a circle.Ĭalculating the circumference of a circle involves a constant called pi with the symbol π. It touches the circle at point B and is perpendicular to the radiusĪ secant is a straight line that cuts the circle at two points. In the above diagram, the line containing the points B and C is a tangent to the circle. A tangent is perpendicular to the radius at the point of contact. The diameter would be the longest chordĪ tangent to a circle is a line that touches a circle at only The diameter is a specialĬhord that passes through the center of the circle. All theĭiameters of the same circle have the same length.Ī chord is a line segment with both endpoints on the circle. That passes through the center of the circle and has its endpoints on the circle. The diameter of a circle is a line segment That distance is known as the radius of the circle. On a planeplane that are the same distance from its center O. In geometry, a circle is a closed curve formed by a set of points Scroll down the page for more examples and explanations. The following figures show the different parts of a circle: tangent, chord, radius, diameter, arc, segment, sector. We shall learn about circles and the properties of circles.
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