Check for Understanding 2 Similarity Unit

Where is the center of dilation?

• (0, 0)

• Q1

• Q4

• Q3

Determine if the two triangles CDE  and FGH are similar or not. If they are similar, state the similarity reason (AA, SSS, SAS) and give mathematical evidence to justify your answer.  If you determine the triangles are not similar, also give mathematical evidence to justify why the triangles are not similar.

• AA Similarity

• SAS Similarity

• SSS Similarity

• These triangles are not similar

Determine if the two triangles CDE  and FGH are similar or not. If they are similar, state the similarity reason (AA, SSS, SAS) and give mathematical evidence to justify your answer.  If you determine the triangles are not similar, also give mathematical evidence to justify why the triangles are not similar.

• AA Similarity

• SAS Similarity

• SSS Similarity

• These triangles are not similar

Given the point A(9, 7), find the coordinates of the image after a dilation with a scale factor of 3 from the origin as a center of dilation. A'=(_,_)

Given the point A(9, 7), find the coordinates of the image after a dilation with a scale factor of 3 using the point (11,4) as a center of dilation. A'=(_,_)

Assume the triangles are similar. Solve for y.

y=_