## Geometry: Common Core (15th Edition)

Published by Prentice Hall

# Chapter 5 - Relationships Within Triangles - Mid-Chapter Quiz - Page 316: 3

#### Answer

$YZ = 104$

#### Work Step by Step

$\overline{AB}$ joins the midpoint of $\overline{XY}$ and also the midpoint of $\overline{XZ}$. According to the triangle midsegment theorem, if a line segment joins two sides of a triangle at their midpoints, then that line segment is parallel to the third side of that triangle and is half as long as that third side. Knowing this information, we can deduce that $\overline{YZ}$, which is the third side, is parallel to $\overline{AB}$, which is the line segment that joins the midpoints of the other two sides of the triangle. It also means that $\overline{YZ}$ is two times the length of $\overline{AB}$. So, if we know $AB$, then we can find $YZ$: $YZ = 2(AB)$ Let's plug in the values we know: $YZ = 2(52)$ Multiply to solve: $YZ = 104$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.