Copy of Introductory Activity: Properties of Similar Triangles

Tell whether triangle DEF is a scaled copy of the original triangle ABC. If yes, what is the scale factor? Reminder: To find the scale factor, you should divide each side of the scaled copy by its corresponding side of the original triangle.

Compare the angles of the triangles ABC and DEF.

The angles of triangles ABC and DEF are:

3) What are the properties of two similar triangles? What can you say about: a- The angles? b- The sides?