To find the new coordinates of point A(2, 6) after a 180-degree counterclockwise rotation about the origin, you can use the rotation formula for 180 degrees:
\[ (x', y') = (-x, -y) \]
For point A(2, 6), we apply the formula:
\[ x' = -2 = -2 \] \[ y' = -6 = -6 \]
So, the new coordinates after the rotation will be:
\[ (-2, -6) \]
Thus, the new coordinates of point A after a 180-degree counterclockwise rotation are (-2, -6).