straight angle
an angle that measures 180 degrees
A straight angle is an angle that measures exactly 180 degrees. It is a line that has been bent such that it forms a straight line or, in a geometrical sense, a single plane. In a straight angle, the two rays or lines that form it are opposite and collinear, meaning they lie on the same line. Thus, a straight angle lies on a straight line or a plane surface, and forms a complete circular arc or a semicircle.
Some examples of real-life instances of straight angles include the edges of a book’s covers, the edges of walls, or the arms of a compass when opened to its maximum extent. In contrast to acute angles, which measure less than 90 degrees, or obtuse angles, which measure more than 90 degrees, a straight angle is the largest possible angle.
It is worth noting that straight angles are important in the study of mathematics, especially geometry, as they help in many calculations related to triangles, circles, and other polygons. Some properties of straight angles include that they can be bisected to form two equal angles of 90 degrees each, and that they can also be used to determine parallel lines.
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