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two points (the endpoints) all the points between them that are on the line containg them.
a ray that shares the vertex of the angle and divides the angle into two congruent angles.
Linear Pair of Angles
a pair of angles that share a side and their non-shared side form a straight line (they are supplementary)
closed figure in a plane, formed by connecting line segmenst endpoint to endpoint with each segment intersecting exactly two others.
diameter (of a circle)
a line segment containing the center of a circle, with endpoints that lie on the circle
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