### Home > CCG > Chapter 10 > Lesson 10.1.2 > Problem10-21

10-21.

On graph paper, plot $ΔABC$ if $A(-1, -1)$, $B(1, 9)$, and $C(7, 5)$.

1. Find the midpoint of $\overline{AB}$ and label it $D$. Also find the midpoint of $\overline{BC}$ and label it $E$.

2. Find the length of the midsegment, $\overline{DE}$. Use it to predict the length of $\overline{AC}$.

3. Now find the length of $\overline{AC}$ and compare it to your prediction from (b).

Use the eTool below to find the solution to parts (a)-(c).
Click the link at right for the full version of the eTool: CCG 10-21 HW eTool