straight angle
an angle that measures 180 degrees
A straight angle is an angle that measures exactly 180 degrees. It looks like a straight line and is often denoted as a line segment with two points marked on it. One way to understand a straight angle is to imagine a line that’s folded in half. The two resulting rays or line segments that emerge from this fold form a straight angle.
Some examples of objects or shapes that may contain straight angles include a rectangle, a square, and a straight horizontal or vertical line. The opposite of a straight angle is a zero angle, which has no width or length and is essentially a point.
Straight angles have some important properties, including the fact that they are always supplementary to each other. This means that if two angles add up to form a straight angle, they must be complementary angles as well, measuring 90 degrees each. Additionally, any straight line that’s drawn across two parallel lines will create eight angles, two of which will be straight angles.
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