The length of a line segment does not change when it is reflected across the x-axis.
To find the length of the original line segment with endpoints (0, 5) and (6, 5), you can use the distance formula:
\[ \text{Distance} = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2} \]
For the endpoints (0, 5) and (6, 5):
\[ x_1 = 0, \quad y_1 = 5, \quad x_2 = 6, \quad y_2 = 5 \]
Plugging these values into the distance formula:
\[ \text{Distance} = \sqrt{(6 - 0)^2 + (5 - 5)^2} = \sqrt{6^2 + 0^2} = \sqrt{36} = 6 \text{ units} \]
After reflection across the x-axis, the new endpoints will be (0, -5) and (6, -5), and the length will still be:
\[ \text{Distance} = \sqrt{(6 - 0)^2 + (-5 - (-5))^2} = \sqrt{6^2 + 0^2} = \sqrt{36} = 6 \text{ units} \]
Thus, the length of the line segment after reflection is still 6 units.