Angles

Two angles are supplementary if their sum is: Two angles are complementary if their sum is: A triangle's angles total _ degrees. A quadrilateral's angles total degrees.

If I said that we had a straight line, it would have a total of _ degrees. What if there were three angles on that line which shared the same vertex, and two of the measures were 78 and 20 degrees? How many degrees would there be in the third angle?