To calculate the midpoint \( M \) of a segment \( AB \), you can use the midpoint formula:
\[ M = \left( \frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2} \right) \]
where \( (x_1, y_1) \) are the coordinates of point \( A \) and \( (x_2, y_2) \) are the coordinates of point \( B \).
Unfortunately, I cannot see the image you're referring to. If you can provide the coordinates of points \( A \) and \( B \), I can help you calculate the midpoint.