Determine whether two triangles are similar. The lesson presents opportunities for pupils to find the criterion needed to show that two triangles are similar. Scholars use the definition of similarity to find any missing side measurements in this 12th installment in a series of 16.

Concepts

similar triangles, similarity, proportions, proportional reasoning, equivalent fractions, equivalent ratios, corresponding sides, corresponding angles, angle angle side theorem

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Additional Tags

math

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Instructional Ideas

• Provide a brief review of solving proportions
• Have the class practice writing the ratios of corresponding sides when given similar triangles

Classroom Considerations

• Class members need to know how to determine equivalent ratios

Pros

• Answer key shows the ratios that must be equal
• Resource contains notes that provide an overview of the entire lesson and examples

Cons

• None

Common Core

8.G.A.4 MP1