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In mathematics, measure can mean the amount of degrees in an angle, the length of a line segment, or a function that assigns a number to subsets of a given set.
The measure of is indicated by , without the bar on top. If , then .
The measure of is indicated by . If , then .
The measure of an angle can expressed in degrees or in radians.
The measure of an arc of a given circle is given by the measure of the central angle subtended by it.
The measure of a set is known as the set's cardinality. If , then the cardinality of set is .