Worked Example 1: Finding Circumference

Part of Circumference & Area of Circles · Section 6 of 10

Study NotesUnit: Geometry & MeasuresGCSE

This study notes covers Worked Example 1: Finding Circumference 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 6 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 1: Finding Circumference

A circle has diameter 14 cm. Find its circumference. Give your answer to 1 decimal place.

Step 1 Write the formula

C = πd

Step 2 Substitute the values

C = π × 14

Step 3 Calculate

C = 43.98... = 44.0 cm (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?

  • A. C = πr², A = 2πr
  • B. C = 2πr, A = πr²
  • C. C = πd², A = πr
  • D. C = 2πr², A = πr
1 markfoundation

Explain why the circumference of a circle is measured in cm (or other length units) but the area is measured in cm² (square units).

2 markshigher

Quick recall flashcards

Area of Circle
A = πr²
Circumference
C = πd or C = 2πr

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Method: Finding Area

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Worked Example 2: Finding Area

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