Ratio

a comparison of two numbers by division

Proportion

an equation that states that two ratios are equivalent

Scale

the ratio between the size of something and a representation of it

Scale Factor

The ratio of the lengths of two corresponding sides of two similar polygons.

Scale Drawing/Model

used to represent an object that is too large or too small to be drawn or built at actual size

Similar Polygons

Two polygons whose corresponding angles are congruent and whose corresponding sides are proportional.

Dilation

A transformation that changes the size of an object, but not the shape.

Similarity

An object that has the same shape but not the same size

Nonrigid Transformation

a transformation that does not preserve the size of the original figure, such as a dilation by a scale factor other than zero or one