Calculating the Perimeter of Composite Figures

Sheena Doria

This educational math video provides a clear, step-by-step guide on how to calculate the perimeter of composite figures. The video begins with a relatable real-world scenario involving an art project to introduce the concept of perimeter as measuring the total distance around a shape. It then progresses from simple composite shapes with all sides labeled to more complex figures where students must use deductive reasoning to find the lengths of missing sides before calculating the total perimeter. The content covers key geometry themes including the definition of composite figures (shapes made of two or more basic shapes like rectangles and triangles), strategies for organizing calculations (such as grouping equal sides), and the critical skill of using parallel sides to determine unknown lengths. The narrator uses specific examples, including an arrow shape and an L-shaped polygon, to demonstrate different problem-solving techniques. For educators, this video is an excellent resource for visual learners and students transitioning from basic perimeter calculations to more complex geometry. The clear visual cues, such as highlighting corresponding parallel sides in different colors, help demystify the process of finding missing lengths—a common stumbling block for students. The pacing allows for pausing and class participation, making it a versatile tool for both direct instruction and review stations.