GCSE Maths Practice: circle-properties

Question 5 of 10

This question teaches correct units for circumference.

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\( \begin{array}{l}\text{What is the unit for circumference?}\end{array} \)

Choose one option:

Use linear units (cm, m) for circumference; do not square the unit.

Circumference measures the distance around the circle and is therefore expressed in linear units, such as cm or m. Students must distinguish between length, area, and volume units to avoid mistakes. For example, if the radius is in centimeters, the circumference is in centimeters, not cm². Correct units are critical in geometry calculations, real-life applications like engineering or construction, and exam accuracy. Practising unit identification for different circle formulas improves understanding of geometric principles and prevents dimensional errors.