Question P4 Angle and shape properties
The shown angle is formed by rays OA and OB. Name the angle at O using three-letter notation.
Answer
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Mark the shape property first, then subtract known angles from the relevant total.
In this one. An angle name uses one point on each arm, with the vertex always in the middle.
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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