Perimeter vs Area — Knowing the Difference (Grades 4–5)
Perimeter is the distance around a shape (add up all the side lengths); area is the space inside (square units). It's easy to mix them up — fencing a yard is perimeter; sodding it is area. For a rectangle, perimeter = 2 × (length + width) and area = length × width.
Understanding perimeter vs area
Perimeter is the distance around a shape (add up all the side lengths); area is the space inside (square units). It's easy to mix them up — fencing a yard is perimeter; sodding it is area. For a rectangle, perimeter = 2 × (length + width) and area = length × width.
Key Idea
Perimeter is the distance around a shape (add up all the side lengths); area is the space inside (square units). It's easy to mix them up — fencing a yard is perimeter; sodding it is area. For a rectangle, perimeter = 2 × (length + width) and area = length × width.
Seeing it in action
Worked example
A rectangle is 5 by 3. Find its perimeter and area.
Perimeter = 2 × (5 + 3) = 16 units. Area = 5 × 3 = 15 square units.
Perimeter goes around; area fills inside.
Try a few
Rectangle 4 by 6 — perimeter?
2 × 10.
Square side 5 — area?
Rectangle 2 by 8 — perimeter and area?
Perimeter Patrol
A calm tile-grid game for building and reading area and perimeter.
Ready for the interactive lab?
Practice perimeter vs area in Numeris with instant feedback.
Put the reasoning on paper.
Try six fraction, angle, perimeter and area questions with explained answers, for grades 4–6.
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