Scale Factor and Similar Figures Vocabulary

A room has an actual width of 20 feet and length of 25 feet.  How should the scale drawing look like if the scale used is 1 unit: 5 feet?

• A

• B

• C

• D

Vocabulary: A ratio between the measurements of the drawing and of the actual object.

• drawing

• constant of proportionality

• scale

• unit rate

Triangle ABC is similar to triangle FGH.
What is the value of x in centimeters?

• 22.5 cm

• 8 cm

• 10.8 cm

• 30 cm

Solve the proportion:

• 4

• 8

• 14

• 10

The ratio used to enlarge or reduce similar figures.

• Scale Factor

• Scale Drawing

• Transformation

• Congruent

A transformation that enlarges or reduces a figure is called (a)   .

• Dilation

• Center of Dilation

• Enlargment

• Reduction

A decrease in the size of all dimensions is called (a)   .

• Reduction

• Enlargment

• Scale Factor

• Similar

Figures with the same shape, but not necessarily the same size are _____.
Spelling Matters!!!

Figures that have the same shape but different sizes; their sides are proportional, and their corresponding angles are equal.

• Scale Factor

• Similar Figures

• Umit Rate

• Equivalent Ratios

A common ratio for pairs of corresponding sides of similar figures.

• Scale Factor

• Rate

• Scale Drawing

• Cross Products