I totally forgot how to do this and was wondering if someone could explain for me. I can't remember how to figure out the 130 degree angle in the picture i've put up.
the blue angles are alternate interior angles, and so, have the same measure
the red angle is the third angle of a triangle. since the angles in a triangle add up to 180 degrees, this angle is equal to 180 - (the sum of the other 2 angles).
when it's all said and done, the desired angle is