### Symbol

The symbol used to represent the similarity between two figures is “∼”,

which means “is similar to”.

### Properties

Two similar figures are figures in which:

- corresponding angles have the same measure;
- the ratios of the lengths of their corresponding sides are equal.

The ratio of the length of a segment in the original figure to the length of the corresponding segment in the image is called the ratio of similarity of the two figures.

### Examples

These figures are similar.

Congruent figures are similar figures.

- All squares are similar figures.
- All circles are similar figures.
- All segments are similar figures.
- All isosceles right triangles are similar figures.