To find the measure of an exterior angle \( x \) of a triangle, you can use the exterior angle theorem. The theorem states that the measure of an exterior angle is equal to the sum of the measures of the two non-adjacent interior angles.
If you have specific measures for the interior angles, you can add those two angles together to find the measure of the exterior angle.
For example, if angle \( A = 50^\circ \) and angle \( B = 60^\circ \), then the exterior angle \( x \) would be:
\[ x = A + B = 50^\circ + 60^\circ = 110^\circ \]
If you provide the measures of the interior angles or additional information about the triangle, I can help you calculate \( x \).