This Instructional Activity is a part of the Lesson 1, Unit 7, Grade 8. Recall the Pythagorean theorem and its converse for right triangles. Write an equation that allows you to determine the length of the unknown side of the right triangle. Consider using cutouts of the triangles in this lesson to further illustrate the difference between triangles with whole number hypotenuses and those without. Then, call on students to measure the lengths directly for Examples 1-3.