Question

Given triangle PQR with vertices P(-3, 4), Q(4,1), and R (-1,-2). What is the length of QR?

Answer 1

They gave you kind of a lot of information, but all you really need to do is figure out the distance between Q and R. Draw yourself a picture.

Answer 2

Understand so far?

Answer 3

Yes, Thank you! :]

Answer 4

Okay so, any time you want to find the length of a line, I think this is the simplest way of thinking about how to do it.
Draw in a couple of lines so that you get a right triangle, and the line you want to find is the hypotenuse. Like this:

Now that you have that triangle, 2 of those sides are really easy to label. If you have 2 sides of a right triangle, you can just use the Pythagorean theorem to find the third. Remember that? a^2 + b^2 = c^2