C. 102°
When two intersecting lines form adjacent angles, they create a straight angle which measures 180°. Since one of the adjacent angles is given as 78°, the measure of the angle created by the intersecting lines would be 180° - 78° = 102°.
What is the measure of the angle created by two intersecting lines whose adjacent angle is 78°?
A. 22°
B. 258°
C. 102°
D. 2°
1 answer