Students should use their prior knowledge of area and two-dimensional shapes from previous grade levels to decompose a composite figure into shapes for which there is a known area formula. A composite figure can be decomposed several ways using individual shapes. When the composite figures is decomposed, students should determine which area formula should be used to calculate the area of each shape, and then the total area of the figure.
7.9 Expressions, equations, and relationships. The student applies mathematical process standards to solve geometric problems. The student is expected to:
(C) determine the area of composite figures containing combinations of rectangles, squares, parallelograms, trapezoids, triangles, semicircles, and quarter circles