angle - two rays with the same endpoint
angle measure - how 'open' an angle is in its interior, commonly measured in degrees
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complement (of an angle) - the measure of an angle that results in a sum of 90° when added to the original angle; commonly found by subtracting the measure of the original angle from 90°
complementary angles - two angles whose measures add to be 90°
degree - common unit of measure for angles, denoted by the ° symbol; there are 360 degrees in a circle
endpoint - a point where a ray (or another 'type' of line) terminates and ceases to continue in the direction of the endpoint
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measure of an angle - see 'angle measure'
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ray - a 'portion' of a line that 'stems' from a point and extends infinitely in one direction
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