Geometric attributes (such as sides and angles) give descriptive information about a shape’s properties and orientation, which supports visualization and problem solving.
In this lesson, students will learn to decompose 2-dimensional shapes by their geometric attributes and name. Students recognize that shapes can be created using other shapes that are placed together and split apart to create individual shapes. This lesson builds on a student's prior knowledge of geometric shape names and their definite geometric attributes, such as lines and angles, as well as the understanding that shapes can be composed of several individual shapes. In this task, students are asked to decompose larger figures and name the shapes that composed the figure. Students will recognize that there may be various ways to decompose a given shape. This lesson lays the foundation for understanding how 3-dimensional shapes are composed of 2-dimensional shapes.
Vocabulary: polygon, triangle, quadrilateral, trapezoid, parallelogram, square, rectangle, rhombus, pentagon, hexagon, irregular, shape, line, side, angle, right angle, straight, compose, decompose
copy of task document (cookie sheet)
white boards (optional)