### Home > CC3MN > Chapter 9 > Lesson 9.1.1 > Problem 9-9

9-9.

Write an equation to represent the situation below, and then answer the question.

Ella is trying to determine the side lengths of a triangle. She knows that the longest side is three times longer than the shortest side. The medium side is ten more than twice the shortest side. If the perimeter is

Create a variable expression for perimeter to represent this problem with the shortest side defined by .

How do the other sides relate to the shortest side, or

*?*

Shortest Side:

Medium side:

Longest Side:

Add the lengths of the sides and set equal to the perimeter in order to solve for .

Shortest Side:

What are the lengths of the other sides?