GCSE Maths Practice: perimeter-and-area

Question 9 of 10

This question practices identifying the circumference formula for a circle.

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

Choose one option:

Use C = 2πr or C = πd; do not confuse with area formula.

Circumference is the total distance around a circle, given by C = 2πr or C = πd. Recognizing that area and circumference have different formulas prevents mistakes. Practice calculating circumference with various radii and diameters to build confidence. This is important in real-life problems like measuring circular tracks or pipes. Always include π in your answer if asked in terms of π.