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Back to Jimbo's Chapter Nine Chords and Arcs

Circles are represented by the symbol and named by the center point of the circle. An unbroken part of a circle is called an arc. For example, the red line is an arc. A semicircle is half a circle. the endpoints are a diameter .

Major and Minor Arcs

The minor arc of a given circle is an arc is shorter than a semicircle from the some circle. In the teal circle above, DE is a minor arc. A major arc is an arc that is longer than the circles semicircle. Minor arcs are named by their endpoints, major arcs are named by the endpoints and another point on the circle