An angle.
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Two and only two rays having the same end points are in an angle.
Start in the same point but are going in opposite directions
endpoints!! endpoints!!
A chord is a line segment whose endpoints lie on a circle. A secant is a line (or line segment) that intersects a circle in two places, endpoints NOT on the circle.
Two lines tangent to a circle at the endpoints of its diameter are parallel. See related link for proof.