# Identifying Similar Triangles Projector Resources Identifying Similar Triangles

- Slides: 13

Identifying Similar Triangles Projector Resources Identifying Similar Triangles

Are these Mathematically Similar? Projector Resources Identifying Similar Triangles P-1

Checking for Similarity Are any of the triangles ABC, CEF and ACD mathematically similar? Projector Resources Identifying Similar Triangles P-2

Working Together Take turns to: 1. Select a diagram, and decide whether or not the two triangles are similar, not similar, or ‘it cannot be determined’. Explain your reasoning. 1. Fill in as many angles as you can. 2. Your partner must challenge your explanation if they disagree or describe it in their own words if they agree. 3. Once agreed, glue the diagram onto the poster and write your explanation in pencil next to it. 1. Continue to take turns until all the diagrams are sorted. Projector Resources Identifying Similar Triangles P-3

Sharing Work 1. One person in your group record your results on your miniwhiteboard and then go to another group’s desk and check your work against theirs. 2. If there are differences, ask for an explanation. If you disagree, explain which column you think is correct. 3. If you have categorized diagrams in the same columns, compare your methods and check that you understand each other’s explanations. 1. If you are staying at your desk, be ready to explain the reasons for your group’s decisions. Projector Resources Identifying Similar Triangles P-4

Are triangles PQR and SPR similar? Projector Resources Identifying Similar Triangles P-5

Are triangles PQS and QRS similar? Projector Resources Identifying Similar Triangles P-6

Are triangles PQR and STU similar? Projector Resources Identifying Similar Triangles P-7

Are triangles PQR and STR similar? Projector Resources Identifying Similar Triangles P-8

Are triangles PQR and STR similar? Projector Resources Identifying Similar Triangles P-9

Are triangles PQR and TRS similar? Projector Resources Identifying Similar Triangles P-10

Are triangles PRS and QRS similar? Projector Resources Identifying Similar Triangles P-11

Are triangles PQR and RST similar? Projector Resources Identifying Similar Triangles P-12

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