Congruence, Similarity, and Scale Factor

Dilate the figure by a scale factor of 3 with the origin as the center of dilation. What are the coordinates of the image?

• A'(9,9) B'(18,18) C'(27,9)

• A'(6,6) B'(9,9) C'(12,6)

• A'(0,0) B'(3,3) C'(6,0)

• A'(1,1) B'(2,2) C'(3,1)

State the coordinate of the image of the given point B (-10,-6) under a dilation with center at the origin with the given scale factor k = 1/2.

• (5,3)

• (20,12)

• (-20,-12)

• (-5,-3)

What does similar mean?

• corresponding sides are proportional and corresponding angles are congruent

• corresponding sides and angles are congruent

• sames shape

• neither sides or angles are congruent

The pair of figures is similar. Find the missing side.

• x = 10

• x = 4

• x = 2

• x = 5

• 2

• 1/2

• 2/3

• 3/2

Which of these angles is NOT congruent to angle 5?

• Angle 6

• Angle 8

• Angle 1

• Angle 4

Triangle ABC is congruent to Triangle XYZ.  What side corresponds to XZ?

• BC

• AB

• AC

• XY

If three sides of one triangle are proportional to three sides of another triangle, then the two triangles are similar.

• AAA

• SAS

• Not similar

• SSS

If two sides of one triangle are proportional to two sides of another triangles and the included angles are congruent, then the triangles are similar.

• SSS

• AA

• ASA

• SAS

what is symbol for similarity

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