Exercises: Circumference and Area of a Circle

Work through each section in order. Use $\pi = \frac{22}{7}$ unless told otherwise, and always write the correct unit with your answer.

Grade 7·20 problems·~27 min·Uganda NCDC Primary 7 Mathematics·lesson·measurement-02

Work through problems with immediate feedback

Fluency Practice

A circle has diameter 14 cm. What is its area? (Use $\pi = \frac{22}{7}$ .)

$616$ cm² -- square the diameter (14) directly and multiply by $\pi$

$44$ cm² -- multiply $\pi$ by the diameter, forgetting to square anything

$154$ cm² -- halve the diameter to find the radius (7), then square that radius before multiplying by $\pi$