12.6. Drawing Arcs
An arc is drawn as a portion of an oval. Arc angles are measured in degrees. Arcs sweep (i.e., move along a curve) from a starting angle by the number of degrees specified by their arc angle. The starting angle indicates in degrees where the arc begins. The arc angle specifies the total number of degrees through which the arc sweeps. Figure 12.22 illustrates two arcs. The left set of axes shows an arc sweeping from zero degrees to approximately 110 degrees. Arcs that sweep in a counterclockwise direction are measured in positive degrees. The set of axes on the right shows an arc sweeping from zero degrees to approximately –110 degrees. Arcs that sweep in a clockwise direction are measured in negative degrees. Note the dashed ...
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