Easey peasy oposite angle is equal other angles are supplementary (supplementary means add to 180, and a straight line=180 so if you look at 2 lines intersecting and think for a little bit, you wiill see why)
oposite angle=30 other angle is adds to 180 30+other=180 subtract 30 other=150 other is oposite other other other=other other 150=other other
<span>Well when 2 lines intersect, there are 4 angles. The opposite angles are the same degrees. Since one angle is 30 degrees, the opposite angle is 30. So 30+30 is 60. Now all the 4 angles added up should be 360 degrees. So 360-60 is 300. Now 300 divided by 2 is 150 so the other 2 angles are 150 degrees.</span>
