### Home > CCAA > Chapter cc36 > Lesson cc36.1.3 > Problem6-30

6-30.

Solve the problem below by defining a variable and then writing and solving an equation. Homework Help ✎

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?

Refer to the Math Notes box in Lesson 1.1.3 to review the 5-D Process.

Side #1 $=$ Side #2
Side #3 $=$ $2($Side #1$)$ $−1$
Make sure the sides sum to $31$.

Side #1 $=$ Side #2 $=8$ cm
What is the length of Side #3?