An equation stating that two ratios are equivalent.

3/4  =  12/16

proportional

Two quantities that form a proportion are

proportional.  Because  3/4 and 12/16 form a proportion,

3/4 and 12/16 are proportional.

rate

A ratio of two quantities with different units.

You read 3 books every 2 weeks.

ratio

A comparison of two quantities using division.

The ratio of

a to b (where b ¹ 0)

can be written

as

a to b, a : b, or a/b. 

For example:

4 to 1, 4 : 1, or 4.

1

scale

A ratio that compares the measurements of a

drawing or model to the actual measurements.

12 cm : 1 cm

2 in. : 15 ft

scale drawing

A proportional two-dimensional drawing of an object.

A blueprint or a map

scale factor

A scale without units. 

For example:  a scale factor of 3:2

scale model

A proportional three-dimensional model of an object

unit rate

A rate with a denominator of 1.

The speed limit is 65 miles per hour.

indirect measurement

Using similar figures to find a missing

measurement that is difficult to find directly.

[image] 

dilation

A transformation in which a figure is enlarged or reduced.

 [image]

cross products