Question P5 Angle and shape properties
One angle on a straight line is 47°. Find the adjacent angle.
Answer
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Mark the shape property first, then subtract known angles from the relevant total.
In this one. Use 180° only for adjacent angles whose outside arms form a straight line.
Look for a named quadrilateral like a rhombus or parallelogram, plus two straight lines crossing inside or through it. Words like "straight line" and "collinear" point to this move.
Children mix up which angle sits opposite which once lines cross at a point away from the main shape. Trace each ray back to its two labelled ends before deciding what faces what.
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