Two square are congruent if they have ________ sides .

Answer

To solve the question, "Two squares are congruent if they have ________ sides," we need to understand the concept of congruence in geometry, specifically for squares.

### Step-by-Step Solution:

1. **Understanding Congruence**:
- Congruent figures are those that have the same shape and size. This means that if one figure can be transformed into another through rotation, reflection, or translation, they are congruent.

2. **Identifying Properties of Squares**:
- A square is a special type of quadrilateral where all four sides are equal in length, and all angles are right angles (90 degrees).
- Therefore, for two squares to be congruent, they must not only have the same shape (which they do, as they are both squares) but also the same size.

3. **Equal Sides**:
- The size of a square is determined by the length of its sides. If two squares have sides of equal length, they will be congruent.
- Thus, we can conclude that two squares are congruent if they have equal sides.

4. **Final Answer**:
- Two squares are congruent if they have **equal** sides.