This study notes covers Worked Example 2: Finding Area within Circumference & Area of Circles for GCSE Mathematics. Revise Circumference & Area of Circles in Geometry & Measures for GCSE Mathematics with 11 exam-style questions and 7 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 7 of 10 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.
Worked Example 2: Finding Area
A circle has radius 5 cm. Find its area. Give your answer to 1 decimal place.
Step 1 Write the formula
A = πr²
Step 2 Square the radius first
r² = 5² = 25
Step 3 Multiply by π
A = π × 25 = 78.539... = 78.5 cm² (1 dp)
Practice questions for Circumference & Area of Circles
A circle has radius r. Which pair of formulas gives the correct circumference C and area A?
Explain why the circumference of a circle is measured in cm (or other length units) but the area is measured in cm² (square units).