In the following figure \(\angle a+\angle b=?\), when \(l\parallel m\): 
180°
The two transversals drawn between the parallel lines l and m cross each other at a single point, and \(\angle a\) and \(\angle b\) are the pair of angles formed on a straight line at that crossing point. Angles on a straight line always add up to \(180°\), regardless of the other angle values given in the figure, so \(\angle a+\angle b=180°\).
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