### Home > GC > Chapter 2 > Lesson 2.2.2 > Problem 2-72

2-72.

For each diagram below, solve for *x*. Explain what relationship from your Angle Relationships Toolkit you used for each problem.

Refer to the Math Notes box.

Daniel is correct because the definition of a rectangle is a quadrilateral with four right angles. Since a square has four sides and four right angles, it must be a rectangle.