Identify Similar Triangles

If two figures are similar their angles are______.

• proportional
• congruent
• supplementary
• complementary

Calculate the value of the scale factor between the 2 triangles

• 2.5

• 3

• 3.5

• 4

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

• x = 12
• x = 3
• x = 40
• x = 4

When you dilate a figure you...

• slide it.
• turn it.
• flip it.
• make it larger or smaller.

Tell whether the two figures are congruent.

• Yes, same size and same shape
• No, same shape but different sizes
• No, different size and different shapes

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

• a reduction
• an enlargement
• a scale
• not proportional

Are the following similar? Why or why not?

• Yes, because the corresponding angles are congruent.
• No, the numbers are even
• No, the sides are 2 times larger, but the width is the same.

Which triangles are similar to triangle A?

• B
• C
• Both
• None

Did the image enlarge, reduce or none of the above?

• Enlarge
• Reduce
• None of the above

Determine if the triangles are similar. If they are, identify the triangle similarity theorem(s) that prove(s) the similarity.

• AA ~ Theorem

• SAS ~ Theorem

• SSS ~ Theorem

• Not similar