Answer:
56
Step-by-step explanation:
180-109=71
71+53=124
180-124=56
All angles in a triangle=180
since 109 is a supplementary angle(supplementary angles= 109+x=180
109+x=180
x=71
the 3rd angle is 71
now,
71+53+f=180(all angles in a triangle=180)
124+f=180
f=56
Hope this helps!
