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Grade 5 Math · World 9: Polygon Palace · Level 89
Congruent or Not?
Use congruence and symmetry to classify shapes.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 89
- Congruent means exactly the same size and shape. If you could slide or turn one shape to sit perfectly on the other, they're congruent.
- Size matters. These two look alike, but one is smaller. They're not congruent.
- Sides and angles can be congruent too. Matching tick marks show congruent sides.
- A line of symmetry makes two congruent halves. That's why folding works!
Georgia's K-12 Mathematics Standards:
- 5.GSR.8.1 — Classify, compare, and contrast polygons based on properties.