Angles
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Angles : Angles are formed by two rays that begin at the same point or share the same endpoint. The angle measures the amount of turn between the two arms and is usually measured in degrees or radians. when two rays intersect is called the vertex. Angles that are 90 degrees are called right angles, and angles that are 180 degrees are called strait angles. Angles less than 180 degrees yet greater than 90 degrees are called as obtuse angles.