Is Randi’s equation valid? Explain your thinking.
Notice the right angle.
Yes, she used the Pythagorean Theorem.
To solve her equation, first rewrite
by multiplying . You may want to review the Math Notes box for Lesson 2.2.2.
Now solve your equation for
Use a generic rectangle to multiply the binomials.
What is the perimeter of Randi’s triangle?
Use the value of
to determine the length of each side of the triangle.