To rotate a point 180 degrees counterclockwise around the origin in the coordinate plane, you can transform the coordinates \((x, y)\) into \((-x, -y)\).
Given the coordinates of point \(A\) are \((2, 6)\):
- Apply the transformation: \[ A'(x', y') = (-x, -y) = (-2, -6) \]
Therefore, the new coordinates of point \(A\) after the triangle is rotated 180 degrees counterclockwise are \((-2, -6)\).