1: supplementary means 180 degrees so subtract 30 from 180 and angle b is 150 degrees. 2: complementary means 90 degrees so subtract 49 from 90 and the second angle is 41 degrees. 3: a right angle is 90 degrees. 4: congruent means same size same shape so if the first angle is 40 degrees then the second angle would also be 40 degrees.
