![](thumbFetcher.php?id=143&size=thumb) | A minor arc is an arc of a circle with a measure of less than or equal to 180 degrees. | |
| ![](thumbFetcher.php?id=241&size=thumb) | A major arc is an arc of a circle with a measure of greater than or equal to 180 degrees | |
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![](thumbFetcher.php?id=272&size=thumb) | The arbelos or "cobbler's knife" is a figure made up from 3 semi circles. | |
| ![](thumbFetcher.php?id=279&size=thumb) | Arc length is a fraction of the circumference. | |
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![](thumbFetcher.php?id=282&size=thumb) | The measure of the angle made by intersecting chords is equal to the average of the measures of the subtended arcs. | |
| ![](thumbFetcher.php?id=283&size=thumb) | 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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![](thumbFetcher.php?id=316&size=thumb) | Any point on the unit circle has the coordinates (cos(θ), sin(θ)). | |
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