### measure Angles

Long ago people wanted to measure angles, for this reason numbers to be arbitrarily assigned to determine the size of angles. Under this arbitrary numbering system, one finish rotation about a suggest is same to a 360 level rotation. (There is another unit of measure for angles besides degrees called radians, in which one complete rotation is equal to 2Π radians; in this message we will use levels as ours default unit for measuring angles.) two angles v the exact same measure are called congruent angles. Congruence in angles is symbolized by a tiny arc drawn in the an ar between rays. Congruent angle are drawn with the same variety of such arcs between their rays. An angle"s measure determines exactly how it is classified.

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### Zero Angles

An angle through a measure of zero degrees is called a zero angle. If this is tough to visualize, consider two light ray that type some angle higher than zero degrees, choose the beam in the . Then snapshot one of the light ray rotating toward the other ray till they both lie in the very same line. The edge they develop has been shrunk from its initial measure to zero degrees. The angle the is now formed has a measure up of zero degrees.

Figure %: A zero angle### appropriate Angles

An angle with a measure of 90 degrees is called a best angle. A right angle is symbolized through a square attracted in the edge of the angle.

Figure %: A ideal angle### straight Angles

An angle through a measure of 180 degrees is referred to as a straight angle. The looks just like a line. Don"t mix up right angles v zero angles.

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### Acute and Obtuse angles

Another method to classify angles by their actions is to consider whether the angle"s measure up is better or much less than 90 degrees. If an angle measures much less than 90 degrees, that is called an acute angle. If that measures an ext than 90 degrees, the is called an obtuse angle. Appropriate angles room neither acute nor obtuse. They"re simply right.