Perimeter of Composite Figures

A composite figure is a figure made up of two or more basic geometric shapes.. To find the perimeter of a composite figure, identify the outer boundary and add up the lengths of all the sides that form the outside edge of the figure.

Explanation Think of tracing around the outside of the shape with your finger - you only count the edges that form the outer boundary.. Break down complex shapes into familiar pieces, but remember you're measuring the distance around the outside, not calculating area.

Examples An L-shaped figure made from two rectangles has dimensions where the outer edges are 12, 4, 8, 2, 4, and 6 units.. The perimeter is units.. A house-shaped figure is formed by a rectangle (8 by 4 units) with a triangle on top.

Mastering perimeter of composite figures helps students build mathematical reasoning. Break down complex shapes into familiar pieces, but remember you're measuring the distance around the outside, not calculating area.

A common mistake is overlooking key conditions. A composite figure is a figure made up of two or more basic geometric shapes. To find the perimeter of a composite figure, identify the outer boundary and add up the lengths of all the sides that form

Big Ideas Math, Course 2 introduces perimeter of composite figures in Circles and Area. This skill appears in Grade 7 and connects to related topics in the same chapter.