Which of the following is an example of closed curve?

Options

A.
B.
C.
D.

Answer

To determine which of the given options is an example of a closed curve, we need to understand what a closed curve is. A closed curve is a shape where the starting point and the endpoint are the same, creating a complete boundary without any openings.

### Step-by-Step Solution:

1. **Understand the Definition of Closed Curve**:
- A closed curve is a shape that completely encloses an area without any gaps or openings.

**Hint**: Remember that a closed curve must connect back to its starting point.

2. **Evaluate the First Option**:
- The first option is an open curve. It does not connect back to the starting point, meaning it has an opening.

**Hint**: Look for any breaks or openings in the curve.

3. **Evaluate the Second Option**:
- The second option appears to be open at one end. Since it does not form a complete loop, it is not a closed curve.

**Hint**: Check if both ends of the curve meet; if not, it is open.

4. **Evaluate the Third Option**:
- The third option is also an open curve. Similar to the previous options, it does not form a closed boundary.

**Hint**: Again, look for any gaps in the shape.

5. **Evaluate the Fourth Option**:
- The fourth option is a triangle. A triangle has three sides and three angles, and it completely encloses an area with no openings.

**Hint**: A triangle connects all its vertices, forming a closed shape.

6. **Conclusion**:
- Based on the evaluations, the only option that is a closed curve is the fourth option, which is a triangle.

### Final Answer:
The correct answer is **Option 4: Triangle**.