GCSE Maths Practice: circle-properties

Question 6 of 10

This question teaches the correct formula for circumference.

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\( \begin{array}{l}\text{Which formula correctly gives the circumference of a circle?}\end{array} \)

Choose one option:

Remember: circumference = 2 × π × radius or π × diameter.

The circumference of a circle is the distance around its boundary. It is calculated using the formula 2πr, where r is the radius, or πd, where d is the diameter. Understanding the correct formula is essential for solving problems involving circle perimeter, real-life applications, and further geometric calculations. Students should practise identifying the radius or diameter in diagrams and applying the appropriate formula. Using incorrect formulas like πr² leads to area instead of circumference. Mastery of these formulas ensures accuracy and builds confidence in circle-related problems.