Question P5 Angle and shape properties
Find each interior angle of an equilateral triangle.
Answer
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Mark the shape property first, then subtract known angles from the relevant total.
In this one. Every equilateral triangle is also equiangular: its three interior angles are 60°.
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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