Answer:85
Explanation:
Step 1:
A triangle equals 180 and we already know two angles so we add 40 plus 45 which equals 85 then subtract 85 from 180 to find the missing angle which equals 95
Step 2: Now since we know the missing angle we use the straight line rule which states:Any straight line equals 180.and under close examination we see the 95 degree angle forms a straight line with the exterior angle so we subtract 95 from 180 and we get 85