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Geometry and TrigonometryEasyDiameter of a coin

Geometry and Trigonometry practice question

A circular coin has a radius of 3.5 millimetres. What is its diameter, in millimetres?

Answer: 7

The diameter is twice the radius.

Common wrong answers

If you answered 3.5
3.5 is the radius.
If you answered 1.75
1.75 halves the radius.
If you answered 12.25
12.25 squares the radius.

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