Answer:
a) a=57° b=123° c=123°
b) f=98° d=98° e=98°
c) g=75° h=75°
Step-by-step explanation:
a) a°+123°=180° (angle on a straight line=180°)
a°=180°-123°
a°=57°
b°=123° (alternative angles)
c=123° (vertically opposite angles are equal)
b)f+82°=180° (angle on a straight line=180°)
f=180°-82°
f=98°
f=d (corresponding angles are equal)
d=e (vertically opposite angles are equal)
c) h=75° (corresponding angles are equal)
g=h (vertically opposite angles are equal)