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Classifying Parts of A Circle

This topic deals with classifying parts of a circle. It also covers the concept of central angle.

Topic: Parts of a Circle

  • A circle is the set of all points in a plane that are at the same distance from a given point, called the center of a circle. A circle is named by its center

  • Radius (plural radii) is a line segment whose endpoints are the center of a circle and any point on the circle respectively

  • Diameter is a line segment that passes through the center of a circle and whose endpoints lie on the circle

  • Chord is a line segment whose endpoints are any two points on a circle

  • An arc is a part of a circle named by its end points

Topic: Diameter and Central Angle

  • A central angle is the angle formed between two radii

  • The two diameters are perpendicular to each other and form four right angles at the centre of the circle

  • The sum of the measures of the central angles of a circle is always 360 degrees

  • The diameter of a circle is twice the radius
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