Which shape is the odd one out: Trapezium, Square, Rhombus, Rectangle?

TrapeziumCorrect answerYour answerSquareCorrect answerYour answerRhombusCorrect answerYour answerRectangleCorrect answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer A

Correct answer: A

A square, a rhombus and a rectangle each have two pairs of parallel sides, so all three are parallelograms.
A trapezium has only one pair of parallel sides, so it is not a parallelogram. It is the odd one out.

Worth noting

Grouping by 'all sides equal' gives square and rhombus against rectangle and trapezium, a 2–2 split, so it cannot find a single odd one. Look for the property that exactly three share.

Concept: Classification: quadrilaterals and parallelograms
Typical timeTypical: 100 s
Your timeYours: —

The rule this testsClassification: the odd one out

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Ten questions from Analogies and Classification, at your own pace.

Which shape is the odd one out: Trapezium, Square, Rhombus, Rectangle?

Explanation