major arc
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The area outside of an angle is called an arc, all angles can be turned into circles and therefore their interior is the measurement and their exterior is an arc. The area in which an angle lies is called a plane of space.
Minor arc
minor arc
An acute central angle will subtend an acute arc, or one that is less than 1/4 of the whole circle.
An arc that lies between the sides of a central angle of 180 degrees is known as a semicircle. A central angle of 180 degrees is half of a full circle, so the corresponding arc covers half of the circumference of the circle. In geometric terms, a semicircle is a special case of an arc where the angle subtended by the arc is exactly 180 degrees.