After reviewing characteristics of seven types of triangles, young geometers discover how to find the missing angle of a triangle. Then, they practice identifying triangles, find missing angles, and find missing side lengths of similar triangles.

Concepts

acute triangles, congruent triangles, obtuse triangles, similar triangles, triangles, equilateral triangles, isosceles triangles, scalene triangles

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Additional Tags

math

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Instructional Ideas

• Have groups create a poster on each of the triangles mentioned in the resource—right, acute, obtuse, equilateral, isisceles, scalene, and similar—and hang them around the class for reference

Classroom Considerations

• Assumes learners are familiar with naming triangles

Pros

• The 14-page packet includes background information on triangles with example problems, 54 practice problems, and answers for the odd numbered questions
• A great resource for boosting geometry skills

Cons

• None

Common Core

4.MD.C.7 5.G.B.3 7.G.B.5