# Basic Geometry

**Similar** figures *have the same shape*, but *might not be the same size*.

- When two shapes are similar, their corresponding sides are proportional (see ratios and proportions) and their corresponding angles are congruent.
- An older sister and a younger sister might be considered similar

**Congruent **figures *have the same shape *and *size*.

- When two shapes are congruent, their corresponding sides and angles are congruent.
- Identical twins might be considered congruent

**Here are two symbols that you need to know:**

~ means similar

≅ means congruent

*Look Out**: be careful when reading which sides correspond to each other; the shapes may be rotated.*