Question

Can you mark one pair of interior angles whose sum is 180°​

Answer 1

Answer:

Each pair of interior angles are inside the parallel lines, and on the same side of the transversal. Try this Drag an orange dot at A or B. Notice that the two interior angles shown are supplementary (add to 180°) if the lines PQ and RS are parallel.

Step-by-step explanation:

If the transversal cuts across parallel lines (the usual case) then the interior angles are supplementary (add to 180°). So in the figure above, as you move points A or B, the two interior angles shown always add to 180°. Try it and convince yourself this is true. Click on 'Other angle pair' to visit both pairs of interior angles in turn.

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