# How to write a math ray geometry A ray starts out at a point and continues off to infinity. It may be helpful to think of a point as a miniscule "dot" on a piece of paper.

### What is a line segment

Midpoints The midpoint of a line segment marks the point at which the segment is divided into two equal segments. The vertex in this case B is always written as the middle letter. Thus, we denote the name of a line passing through the points A and B as , where the two-headed arrow signifies that the line passes through those unique points and extends infinitely in both directions. The distance between two points P and Q is called length of denoted as PQ. Lines are uniquely determined by two points. It is denoted by In the above figure P and Q are two points and the shortest distance between them is called a line segment. If the lines they lie on never intersect, they are called parallel. We call this line segment AB or line segment AB note the bar on top. You are now ready to move to types of angles. In other words, those figures intersect somewhere. We can name a ray using its starting point and one other point that is on the ray: this is ray QP or ray note the one arrowhead. This notation shows that the ray begins at point A and extends infinitely in the direction of point B. These plane surfaces are used to connect any two or more points on a straight line.

Note that neither lines nor rays can have midpoints because they extend infinitely in at least one direction. A ray beginning at the point A that passes through point B is denoted as. Many people think that an angle is some kind of slanted line.

This is line EF or line note the arrowheads. The vertex in this case B is always written as the middle letter. A line has no beginning point or end point. It is denoted by In the above figure P and Q are two points and the shortest distance between them is called a line segment. A line segment extending endlessly in one direction is called Ray. You are now ready to move to types of angles.

### How to name a ray

Note that the notation for lines and line segments differ because a line segment has a defined length, whereas a line does not. Whichever naming convention your text uses is the one you should use. A ray has one endpoint, which marks the position from where it begins. A line is one-dimensional, having length, but no width or height. Line Segments Consider the task of drawing a "straight" line on a piece of paper as we've done when thinking about lines. We can name a line using two points on it. These plane surfaces are used to connect any two or more points on a straight line. For instance, if M is the midpoint of the segment , then. Imagine it continuing indefinitely in both directions. We write the name of a line segment with endpoints A and B as.

Points A, B, and C Lines Lines in geometry may be thought of as a "straight" line that can be drawn on paper with a pencil and ruler.

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