Chapter 5 Ratio Proportion and Similar Figures

The middle two numbers in a proportion.

• extremes of the proportion

• similarity ratio

• scale factor

• means of the proportion

The positive number x such that a/x = x/b

• Geometric Mean

• Scale Factor

• Scale Drawing

• Means of a proportion

Similar Polygons

• Figures that have the same shape but not

  necessarily the same size.

• Figures with corresponding angles that are

  congruent and corresponding side lengths

  that are proportional.

• The ratio of corresponding linear

  measurements of two similar figures.

• A drawing where all lengths are proportional

  to their corresponding actual lengths.

If two figures are similar, the corresponding sides are ______________.

• equal

• congruent

• proportional

• none of these

The triangles are similar, solve for the question mark.

• 8

• 12.5

• 18

• 24

Are the triangles similar? If so, what similarity shortcut is used? Show all work.

• Similar.  SSS

• Similar.  SAS

• Similar.  AA

• Not Similar.

The ratio of the corresponding sides of two similar triangles is 3:5.  What is the ratio of the perimeters of these triangles?

• 5:3

• 9:25

• 3:5

• 6:10

If two figures are similar their angles are______.

• proportional

• congruent

• supplementary

• complementary

Give the reason for similarity

• AA

• SAS

• SSS

• Not similar

If the triangles are similar, state why.

• AA

• SAS

• SSS

• Not similar