GCSE Maths Practice: perimeter-and-area

Question 6 of 10

This question requires calculating the radius from a given circumference.

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\( \begin{array}{l}\text{Find the radius of a circle if the circumference is } 10\pi\,\text{cm}.\end{array} \)

Choose one option:

Use r = C ÷ 2π. Check units carefully.

Given a circle's circumference, C = 2πr, the radius can be found by dividing C by 2π. Example: C = 10π → r = 10π ÷ 2π = 5 cm. This skill is useful in design, construction, and geometric problem solving. Practice with different circumferences helps quickly identify radius without errors. Always ensure units match.