Perimeter is the total distance around a closed polygon, found by adding the lengths of all its sides in consistent units; learners solve real-world problems involving rectangles, other polygons, and composite rectilinear figures, including finding an unknown side when the perimeter and remaining sides are known. They distinguish perimeter from area and interpret diagrams and measurements accurately; this scope excludes circumference, algebraic generalization, and more advanced geometric cases.
Perimeter is the total distance around the outside of a closed shape. To find it, add the lengths of all the sides. Make sure all measurements use the same unit.
Example: A rectangular garden is long and wide. What is its perimeter?
A rectangle has two equal lengths and two equal widths:
Add all four sides:
The garden’s perimeter is . Perimeter measures the distance around the garden, not the space inside it.
Click a topic below to practice the foundational skills you'll need, learn the steps, or master this skill
Earned ?