Question P4 Angle and shape properties
Measure the smaller angle shown in the figure.
Answer
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Mark the shape property first, then subtract known angles from the relevant total.
In this one. Choose the protractor scale that begins at zero on the aligned ray; the other scale gives the supplement.
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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