Consider isosceles trapezoid ABCD where m(A) = 80, the m(B) = 100. A and B are supplementary, but they do not make a straight line.

Similarly, in https://brilliant.org/practice/complementary-and-supplementary-angles/?p=4 angle A and B are supplementary, but they don't necessarily make a straight line. In fact, to be a straight line, A and B would have to be the same point. So there isn't enough information to determine.

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TopNewestHi Frank,

In future, if you have an issue with a problem, you can click on the menu to select "Report problem", which will allow the problem creator to respond to you directly.

The phrase "angles form a straight line" does not mean that they currently form a line, but that they can be placed so as to form a straight line. For example, we say that the "angles in a triangle form a straight line", even though none of them meet at the same point. – Calvin Lin Staff · 6 months, 1 week ago

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