### Home > CC3 > Chapter 9 > Lesson 9.2.7 > Problem9-149

9-149.

Use a graph to find the distance between the points $C(−4, −1)$ and $D(4, 1)$.

Turn line $CD$ into a right triangle, with legs parallel to the $x$- and $y$-axes.

Use the Pythagorean Theorem to find the length of the line segment connecting the two points.

$8^{2} + 2^{2} = c^{2}\\ 64 + 4 = c^{2}\\ 68 = c^{2}\\ c = \sqrt{68} \approx 8.25$

Complete the table in the eTool below to graph the points.
Click the link at right for the full version of the eTool: CC3 9-149 HW eTool (Desmos)