Answer:
y = 114
Step-by-step explanation:
A square always adds up to 360 degrees. Keeping this in mind, we have to create an equation to get the answer.
66 + 66 + y + y = 360
Add.
[tex]132+y^{2} =360[/tex]
Get the variable to one side.
[tex]y^{2} =228[/tex]
Now divide by 2 so you can have it for both missing angles.
y = 114
The reason for two y's in the equation we created is because there are two missing angles. To prove it is a parallelogram you need to find both angles. To prove the equation you can add up all of the angles.
Hope this helped you out.
