two lines or rays with a common endpoint.
The common end point is known as the vertex.
We name triangles based on their points.
We name triangles based on their points.
This triangle is called triangle ABC.
It could also be called triangle CBA.
The point at the vertex must always be the middle letter.
What would this triangle be called?
If you said triangle NMO or triangle OMN you are correct! Remember the point at the vertex is always the middle letter.
Click here to review information about points and rays.