Question 484146
The 1st angle = the 3rd angle due to geometry.
So 2x+40 = x+2y
-40-x: x=2y-40.
The first two angles sum to 180 due to geometry.
So 2x+40 + 2y+40 = 180.
-80 then /2:  x + y = 50
sub for x: 2y-40 + y = 50
3y = 90
y = 30
x = 2(30)-40 = 60-40 = 20
A1 = 2(20)+40 = 80, A2 = 2(30)+40 = 100, A3 = 20+2(30) = 80.
Note that it is important to compute A3 rather than assume no errors and just use A3 = A1.