GCSE Maths Practice: perimeter-and-area

Question 4 of 10

This question focuses on calculating the circumference of a circle given its radius.

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\( \begin{array}{l}\text{Find the circumference of a circle with radius } 7\,\text{cm}, \text{ giving your answer in terms of } \pi.\end{array} \)

Choose one option:

Use C = 2πr, double-check radius, and include π in your answer.

The circumference of a circle is the distance around the circle, calculated as C = 2πr, where r is the radius. For a circle with radius 7 cm, C = 2 × π × 7 = 14π cm. Understanding circumference is crucial for solving perimeter and real-world circular problems, such as fencing circular areas or wheels. Always multiply by 2 and retain π if the answer is in terms of π. Practice with different radii to become confident in applying the formula quickly.