Question P5 Angle and shape properties
An isosceles triangle has a vertex angle of 52°. Find each equal base angle.
Answer
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Mark the shape property first, then subtract known angles from the relevant total.
In this one. Equal sides face equal angles. Subtract the vertex angle, then divide the remainder by two.
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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