Area of Composite Figures

Virginia·

Geometry

Preview

At a Glance

Grade Level3rd Grade

SubjectGeometry

Original Prompt

create an exit ticket for 3rd grade math TEKS 3.6 Geometry and measurement. The student applies mathematical process standards to analyze attributes of two-dimensional geometric figures to develop generalizations about their properties. The student is expected to: 3.6(D) decompose composite figures formed by rectangles into non-overlapping rectangles to determine the area of the original figure using the additive property of area; and

This lesson focuses on breaking apart composite shapes into simpler rectangles to calculate total area using the additive property. Students will review how to find the area of a rectangle by multiplying its length by its width. The lesson includes a worked example with an L-shaped figure, demonstrating the process of decomposing the shape into two rectangles, calculating their respective areas, and then adding those areas to achieve the total area. Students will also practice with composite shapes like T-shapes and plus signs, followed by an exit ticket that further reinforces their understanding through real-world applications of decomposing shapes and calculating total area.