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Grade 3 Math · World 8: Area and Perimeter Park · Level 75
What Is Perimeter?
Add the side lengths to find the distance around.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 75
- Perimeter is the distance all the way around a shape. Picture an ant walking along the edge, back to where it started.
- Your turn! Tap each little side, all the way around the outside.
- The ant walked 14 units. The perimeter is 14 units: 4 + 3 + 4 + 3.
- With side lengths, add them all. 5 feet plus 3 plus 5 plus 3 is 16 feet.
- Area covers the inside, in square units. Perimeter goes around the outside, in units. A fence is perimeter. A carpet is area.
Georgia's K-12 Mathematics Standards:
- 3.GSR.8.1 — Determine the perimeter of a polygon and explain that the perimeter represents the distance around a polygon. Solve problems involving perimeters of polygons.