You use four stakes and string to mark the foundation of a house. You want to make sure the
foundation is rectangular. A friend measures the four sides to be 30 feet, 30 feet, 72 feet and 72
feet. He says these measurements prove that the foundation is rectangular. Is he correct?
Explain why or why not? If the friend is not correct, what additional information would be
needed to show that the house is rectangular?
