+1982 Which pair of angle measurements are supplements?
A. 59; 121
B. 89; 99
C. 62; 138
D. 30; 60
+1223 Supplementary angles add up to 180 degrees, so add the angles from each pair to see if they add to 180 degrees.
A) 59 + 121 = 180
B) 89 + 99 = 188
C) 62 + 138 = 200
D) 30 + 60 = 90
Only A is the right choice. Note that the angles in answer choice add up to 90 degrees, so they are called complements.
