Question P5 Angle and shape properties
Two angles on the same non-parallel side of a trapezium lie between its parallel bases. One is 76°. Find the other.
Answer
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Mark the shape property first, then subtract known angles from the relevant total.
In this one. The parallel sides create a pair of co-interior angles on the transversal, so they are supplementary.
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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