### Home > CCG > Chapter 2 > Lesson 2.2.2 > Problem 2-77

2-77.

Mike doesn’t think that’s right. “*I think it should go in the right region because it is a square, not a rectangle.*”

“*But a square IS a rectangle!*” protests Daniel. Who is right? Explain your thinking.

Review the definition of a rectangle. Does a square fit this definition?

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.