Part 1 Each of the orange triangles above is a dilation of one of the green triangles. Match each triangle to its corresponding similar green triangle and scale factor: Explain how you can verify the scale factor for each pair of similar figures.

Choose two similar triangles from the set of triangles. Use a ruler to measure all three lengths of one triangle but only two lengths of the other. Sketch the triangles below and label the 5 lengths measured.

Explain how you can use the fact that the triangles are similar to determine the length of the remaining side of the other triangle without measuring it.