This Instructional Activity is a part of the Lesson 17, Unit 3, Grade 7. Provide a circle divided into 16 equal sections for students to cut out and reassemble as a rectangle. Complete the exercise below. To find the formula for the area of a circle, cut a circle into equal pieces. Arrange the triangular wedges by alternating the "triangle" directions and sliding them together to make a "parallelogram." Cut the triangle on the left side in half on the given line, and slide the outside half of the triangle to the other end of the parallelogram in order to create an approximate "rectangle."