### Home > GC > Chapter 7 > Lesson 7.1.2 > Problem 7-18

7-18.

On graph paper, plot the points

*A*(−5, 7) and*B*(3, 1). 7-18 HW eTool (Desmos). Homework Help ✎Find

*AB*(the length of). Locate the midpoint of

and label it *C*. What are the coordinates of*C*?Find

*AC*. Can you do this without using the Pythagorean Theorem?

Use the Pythagorean Theorem to find the length of *AB*.

Use two congruent slope triangles to find the midpoint.

Because *C* is the midpoint, what does that tell you about the length of *AC*?

Use the eTool below to find the length and midpoint of *AB*.

Click the link at right for the full version of the eTool: GC 7-18 HW eTool