compare with a right angle
Is the shown 45° angle smaller or larger than a right angle?
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smaller than a right angle
The pattern behind it: Angle and shape properties
Mark the shape property first, then subtract known angles from the relevant total.
In this one. A right angle provides a ninety-degree benchmark for comparing turns.
How to spot it
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.
Common mistake
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.
Try one like it
Standard compare with a right angle Is the shown 120° angle smaller or larger than a right angle?The 33 problem patterns
All 33 patterns, one to a page — the 19 behind Primary 5 and 6 word problems, and the skills the younger years are built on. The bar model, how to spot it in the question, and the mistake children make. A booklet you can print. Free.
A PDF, and a note when new solutions go up.