Stacey drew a triangle on a coordinate plane. She wrote down the ordered pair for each vertex. How many ordered pairs did she write down?
How many vertex's does a triangle have? That's your answer.
Also, how many apostrophes does the word "vertices" have?
To find out how many ordered pairs Stacey wrote down, we need to determine the number of vertices in the triangle.
A triangle has three vertices, so Stacey would have written down three ordered pairs.
If you have the ordered pairs, you can easily count how many pairs Stacey wrote down by counting the number of vertices in the triangle.