This Problem Set is a part of the Lesson 4, Unit 5, Grade 1. In this lesson, students create composite shapes (hexagons, rectangles, and trapezoids) from triangles, squares, and rectangles. They recognize that the same composite shape (whole) can be made from a variety of shapes (parts). For example, a hexagon might be made by composing six triangles or two trapezoids or one trapezoid and three triangles.