You're already familiar with perimeter, thanks to a previous lesson. This time we'll look at perimeter examples where one of the sides is missing a number. You'll learn how to create an addition equation to calculate the perimeter, even if one of the sides of the shapes is unknown. Come with us, as we practice with triangles, rectangles, trapezoids, pentagons, and real world examples!

Solve real world and mathematical problems involving perimeters of polygons, including finding the perimeter given the side lengths, finding an unknown side length, and exhibiting rectangles with the same perimeter and different areas or with the same area and different perimeters.