The correct answer to the question "The point halfway between two endpoints of a line segment is a(n):" is:

D. midpoint

The midpoint is the point that lies exactly halfway along a line segment, equidistant from both endpoints.

Would you like further explanation or have any questions about this topic?

Related Questions:

1. How is the midpoint formula derived?
2. Can you explain the difference between a ray and a line segment?
3. What is a vertex in geometry, and how is it different from a midpoint?
4. How does the midpoint relate to bisectors in geometry?
5. What are practical applications of finding the midpoint in real-world scenarios?

Tip: To find the midpoint of a line segment with endpoints $(x_1, y_1)$ and $(x_2, y_2)$, use the formula: $\text{Midpoint} = \left(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}\right)$