Similarity of Triangles Scale Factor

What is the scale factor from ΔDEF to ΔABC?

• 1/2

• 7/3

• 2

• 10/3

What is the ratio of the side lengths of XYZ:ABC?

• 1.25

• 1.5

• 2

• 2.5

How long is side x?

• 3

• 1.5

• 8

• 2/3

If the scale factor is less than one, the new figure will be

• an enlargement

• a reduction

• a scale factor

• bigger

If the scale factor is greater than one, the new figure will be

• reduction

• enlargement

• scale

• not proportional

Two objects that are the same shape but not the same size are _______.

• Congruent

• Vertical

• Similar

• Complementary 

All angles in similar figures are congruent.  

• True

• False

Sides in similar figures must be proportional.  

• True

• False 

Which triangles are similar to triangle A?

• B

• C

• Both

• None

Which is NOT true about similar triangles.

• The angles in the triangles are congruent to each other.

• The sides are proportional to each other.

• The angles in each triangle add up to 180^o.

• The triangles must have at least one side that is the same length.