two angles are supplementary. they have the following measures m-angle/ACB = x and m-angleBCD = 260°. what is the measure of angle ACB?
The sum of supplementary angles is always 180°.
Given that the measure of angle BCD is 260°, and angles ACB and BCD are supplementary, we can set up the equation:
x + 260° = 180°
Subtracting 260° from both sides:
x = 180° - 260°
x = -80°
Therefore, the measure of angle ACB is -80°.