a side of the triangle below has been extended to form an exterior angle of 128°. find the value of xx.
To find the value of XX, we need to use the fact that the exterior angle of a triangle is equal to the sum of its two interior opposite angles.
Since the exterior angle is 128°, and one of the interior opposite angles is 90°, we can write the equation:
90° + XX = 128°
To solve for XX, we subtract 90° from both sides of the equation:
XX = 128° - 90°
XX = 38°
Therefore, the value of XX is 38°.