# How do you write a ray in geometry

Think of the sun's rays: they start at the sun and go on indefinitely.

## Line segment ray

Fair enough. Or, we can name a line using a lowercase letter: this is line s. So obviously, I've never encountered something that just keeps on going straight forever. So, let me get the module going. So what is this thing right over here? All right, now what about this thing? So hopefully that gives you enough to work your way through this module.

We can name a line using two points on it. So hopefully that gives you enough to work your way through this module.

A line segment is something just like that. So once again, it is a line.

### Parallel lines

So that's its starting point, but then it just keeps on going on forever. Or, we can name a line using a lowercase letter: this is line s. And that's exactly what this video is. And so the mathematical purest geometric sense of a line is this straight thing that goes on forever. Think of the sun's rays: they start at the sun and go on indefinitely. It's the video for this module. We can show that by drawing an arrow at one end of the ray. So what is this thing right over here? So that right over there is a ray. It doesn't have a starting point and an ending point.

When two points are connected with a straight line, we get a line segment. And so, a line segment is actually probably what most of us associate with a line in our everyday lives. It doesn't have a starting point and an ending point.

Or, we can name a line using a lowercase letter: this is line s. And so the mathematical purest geometric sense of a line is this straight thing that goes on forever.

But in math-- that's the neat thing about math-- we can think about these abstract notions. Now it's taking some time, oh, correct, next question. So this right over here is a line segment.

To name an angle, we use three points, listing the vertex in the middle. Fair enough.

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