Answer:
C = 20
Step-by-step explanation:
The sum of the angles of a triangle is 180
73+87+c =180
Combine like terms
160 +c = 180
subtract 160 from each side
160+c-160 = 180-160
the answer is 20/c
first add the two angle degrees and then subtract by 180
73+87
160
180-160
20
