Answer:
a) 60°
b) 50°
c) 80°
d) 100°
Step-by-step explanation:
a) The entire angle that angle a is in is given to be 90 degrees. 90-30=60.
b) The entire angle that angle b is in is given to be 90 degrees. 90-40=50.
c) c and 100° together make up a straight line. Thus, 100+c=180. c = 80.
d) Angle d and 100° are vertical angles. Vertical angles are congruent, so d = 100.
