Students do not have to work out the missing angle. That has already been done. All they need to do is select the reason from; Straight Line add to 180o, Opposite angles equal, Angles at a point add up to 360o, Angles in triangle add to 180o, Angles in a quadrilateral add to 360o, Alternate angles, Corresponding angles, Interior angles
that should go with the diagram if this were an exam question.
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Very helpful thanks
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