Answer:
c+d(x)= 180°
Step-by-step explanation:
supplemental angles are supplementary if the sum of their measurements is 180°. each angle is called the supplement of the other.
for instance, in a car, the speedometer and the angles within formed by the needle and the base of the speedometer are supplements of one another.
the measurement of an angle measuring 63° is 180° - 63° = 117°
