Straight Angle
An angle with a degree measure of 180°.
A straight angle is an angle which measures exactly 180 degrees or π radians. A straight angle is formed by a straight line and two opposite rays or line segments pointing in opposite directions, with a common endpoint called the vertex of the angle. The two opposite rays or line segments that form a straight angle divide the plane into two equal halves, creating two adjacent angles that are also equal and have a measure of 90 degrees or π/2 radians each. Therefore, a straight angle is also called a flat angle or a half-turn.
Examples of a straight angle in real life include a straight line, the edge of a book, the corner of a room, etc. It is important to note that a straight angle cannot be acute or obtuse since it is exactly in the middle of 0 and 360 degrees or 0 and 2π radians.
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