Answer:
a= 100
b= 15
c= 165
Step-by-step explanation:
Since a and the 80 are supplementary (on a straight line), you need to subtract 80 from 180 to get a.
180-80= 100
a=100
a+b+c= 180, because all angles of a triangle add up to 180 degrees. 100+65+b=180
165+b=180
b=15
C is supplementary to b, so 180-15=165
c=165
