Which statements can be used to justify the fact that two right angles are supplementary? Check all that apply.
a. A right angle measures 90°.
b. If two angles are complementary, the sum of the angles is 90°.
c. If two angles are supplementary, the sum of the angles is 180°.
d. A complementary angle is one-half the measure of a supplementary angle.
e. A supplementary angle is twice the measure of a complementary angle.
