opposite rays
two rays that have a common endpoint and are collinear
Opposite rays are two rays with a common endpoint, which extend in opposite directions forming a single straight line. The two rays are also called co-terminal rays. The common endpoint is called the vertex of the opposite rays. Opposite rays are always collinear, meaning they lie on the same straight line.
Opposite rays are named using their endpoint and another point on each ray. For example, if the common endpoint is point A and two other points on each ray are B and C, respectively, then the opposite rays can be denoted as ray AB and ray AC.
The two rays always have opposite directions, meaning if ray AB points towards the right, then ray AC will point towards the left. Similarly, if ray AB points upwards, ray AC will point downwards.
Opposite rays are important in geometry because they can be used to bisect angles. When an angle is bisected, it is split into two equal angles by a line that passes through the vertex of the angle. This approach is essential in constructing geometric figures, making measurements, and solving various mathematical problems.
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