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Circle

A minor arc is an arc of a circle with a measure of less than or equal to 180 degrees.
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A major arc is an arc of a circle with a measure of greater than or equal to 180 degrees
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The arbelos or "cobbler's knife" is a figure made up from 3 semi circles.
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Arc length is a fraction of the circumference.
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The measure of the angle made by intersecting chords is equal to the average of the measures of the subtended arcs.
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If secants intersect outside the circle, the angle between the secants is equal to the difference of the measures of the subtended arcs divided by two.
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Any point on the unit circle has the coordinates (cos(θ), sin(θ)).
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Geometry Expressions