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Lines, rays, and angles - a free geometry lesson with exercises To name an angle, we use three points, listing the vertex in the middle. This is angle DEF or ∠DEF. We can use the symbol ∠ for angle. 1. Write if each figure is a line, ray, line segment, or an angle, and name it. 2. a. Find the angle formed by the rays DE and DF. How do we name it? b. Find the angle formed by the rays CA and CE. Lines, Segments, and Rays - Varsity Tutors When we draw lines in geometry, we use an arrow at each end to show that it extends infinitely. A line can be named either using two points on the line (for example, A B ↔ ) or simply by a letter, usually lowercase (for example, line m ). A line segment has two endpoints. It contains these endpoints and all the points of the line between them. Lines in Geometry (Definition, Types & Examples) - BYJUS Solution: If the tangents have to be parallel to the line then they must have the same gradient. The standard equation for a straight line is...