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Year 9 maths · L.17 · Angles and polygons

Are two triangles similar? Compare angles

Triangles are similar if their angles match. Find each third angle first. Write yes or no.

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  1. Triangle 1 has angles of 73° and 27°. Triangle 2 has angles of 73° and 27°. Are the triangles similar? Write yes or no.

    Answer: yes

  2. Triangle 1 has angles of 84° and 40°. Triangle 2 has angles of 56° and 40°. Are the triangles similar? Write yes or no.

    Answer: yes

  3. Triangle 1 has angles of 65° and 30°. Triangle 2 has angles of 65° and 30°. Are the triangles similar? Write yes or no.

    Answer: yes

Tip: Triangles are similar if their angles match. Find each third angle first. Write yes or no.

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