Question

# Below is a picture of the triangle in R^{3} whose vertices are the points p and q and r. This picture is

very easy to create using a command in the *plots* package. Find this command yourself: look at the list of commands in *plots*, guess, and then use *help*. A hint: The command you're looking for can do more than triangles. It can also plot quadrilaterals, pentagons, hexagons, and many other two-dimensional shapes in three dimensions.