Question: Select all of the statements that are always true for a rhombus.
The opposite angles are equal. — center
Exactly one diagonal bisects a pair of opposite angles. — center
The diagonals are equal. — center
The opposite sides are parallel. — center
None of these. — center
1. **State the problem:** We need to determine which statements are always true for a rhombus.
2. **Recall properties of a rhombus:**
- All sides are equal in length.
- Opposite sides are parallel.
- Opposite angles are equal.
- Diagonals bisect each other at right angles.
- Each diagonal bisects a pair of opposite angles.
- Diagonals are generally not equal in length (unless the rhombus is a square).
3. **Evaluate each statement:**
- "The opposite angles are equal." This is true for all rhombuses.
- "Exactly one diagonal bisects a pair of opposite angles." This is false; both diagonals bisect opposite angles.
- "The diagonals are equal." This is false unless the rhombus is a square.
- "The opposite sides are parallel." This is true for all rhombuses.
- "None of these." This is false because some statements are true.
4. **Final answer:** The statements that are always true for a rhombus are:
- The opposite angles are equal.
- The opposite sides are parallel.
Hence, the correct selections are these two statements.