### Home > CAAC > Chapter 6 > Lesson 6.1.1 > Problem 6-7

6-7.

Solve the problem below using a Guess and Check table. **Note****:** *Be sure to put your work in a safe place, because you will need it for the next lesson*.

The perimeter of a triangle is 31 cm. Sides #1 and #2 have equal length, while Side #3 is one centimeter shorter than twice the length of Side #1. How long is each side? Homework Help ✎

What must you guess and what must you check?

Guess side 1 and check that the perimeter = 31 What is the relationship between side 1 and the other sides?

Side 1 = Side 2

Side 3 = 2(Side 1) − 1

Use this information to create your Guess and Check chart.

Make sure the sides sum to 31.