Question: Select all of the statements that are always true for a square.
The diagonals bisect the angles of the quadrilateral.
The diagonals are equal.
The opposite angles are equal.
The diagonals intersect each other at right angles.
None of these.
1. **Problem:** Determine which statements are always true for a square.
2. **Recall properties of a square:**
- All sides are equal.
- All angles are right angles ($90^\circ$).
- Diagonals are equal in length.
- Diagonals bisect each other at right angles.
- Diagonals bisect the angles of the square.
- Opposite angles in a square are equal (both $90^\circ$).
3. **Evaluate each statement:**
- "The diagonals bisect the angles of the quadrilateral." \(\rightarrow\) True for a square because each diagonal splits the $90^\circ$ angles into two $45^\circ$ angles.
- "The diagonals are equal." \(\rightarrow\) True, diagonals of a square have equal length.
- "The opposite angles are equal." \(\rightarrow\) True, all angles in a square are $90^\circ$, so opposite angles are equal.
- "The diagonals intersect each other at right angles." \(\rightarrow\) True, diagonals of a square intersect at $90^\circ$.
- "None of these." \(\rightarrow\) False, since multiple statements are true.
4. **Final answer:** The first four statements are always true for a square. "None of these" is false.