you know all the angles amount to 360 degrees in the rhombus. I will give you one more clue:
Opposite angles are equal so:
Angle 1=Angle 2 and Angle 3=Angle 4 (which is not drawn)
Then, angle 2= angle 1=140,
If angle 1=angle 2= 140, how much is angle 1+angle 2
60 and 80 which equals 140
That's because angle 3 is half of 40 (it's 20). Notice the line going through the middle of the shape, the angle labeled 3 is only talking about half of the full corners angle, it's only asking for the bottom half of that angle.
