Angle
Two rays that meet at a commonendpoint called a vertex
An angle is a measure of rotation formed by two intersecting lines or rays. It is measured in degrees or radians, and it determines the amount of turn an object makes around a point. The point where the two lines or rays meet is called the vertex of the angle, and the two lines or rays are called the arms or sides of the angle.
Angles can be classified based on their angles of rotation. An acute angle measures less than 90 degrees, a right angle measures exactly 90 degrees, an obtuse angle measures greater than 90 degrees but less than 180 degrees, and a straight angle measures exactly 180 degrees.
Angles can be added, subtracted, multiplied, and divided in algebraic equations. The sum of the measures of the angles of a triangle is always 180 degrees, and the measures of complementary angles (two angles whose sum is 90 degrees) add up to 90 degrees. The study of angles is an important part of geometry and mathematics.
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