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Grade 4 Math · World 9: Angle and Shape Studio · Level 92
Classify Triangles
Sort triangles by their angles and their sides.
Warm-up, learn, try it together, practice, then a quick check. About 15 minutes.
What children learn in Level 92
- Triangles can be sorted by their angles. A right triangle has a right angle. An obtuse triangle has an obtuse angle. In an acute triangle, all three angles are acute.
- They can be sorted by their sides too. Tick marks show equal sides. Equilateral: all 3 equal. Isosceles: at least 2 equal. Scalene: none equal.
- A triangle gets one name from each list. This one is a right isosceles triangle.
Georgia's K-12 Mathematics Standards:
- 4.GSR.8.2 — Classify, compare, and contrast polygons based on lines of symmetry, the presence or absence of parallel or perpendicular line segments, or the presence or absence of angles of a specified size and based on side lengths.