1. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. Hints and tips for dealing with the circumference and area of a circle. Objectives

2. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. You will have already seen the formulae for the area and circumference of a circle. O Centre O Radius r r

3. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. Circumference r = Perimeter of the Circle = π x Diameter Diameter = π x (2 x radius) = π x 2r = 2πr You will have already seen the formulae for the area and circumference of a circle.

4. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. r Diameter You will have already seen the formulae for the area and circumference of a circle.

5. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. r Diameter B I D M A S You will have already seen the formulae for the area and circumference of a circle.

6. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. r Diameter Brackets – None here I D M A S You will have already seen the formulae for the area and circumference of a circle.

7. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. r Diameter B Indices – Yes – Square r first D M A S You will have already seen the formulae for the area and circumference of a circle.

8. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. r Diameter B I Division – None here M A S You will have already seen the formulae for the area and circumference of a circle.

9. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. r Diameter B I D Multiplication – Multiply next A S You will have already seen the formulae for the area and circumference of a circle.

10. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. r Diameter B I D M Addition – None here Subtraction – None here You will have already seen the formulae for the area and circumference of a circle.

11. Edexcel GCSE Maths Spec B – Modular: Booster C © Pearson Education 2010. This document may have been altered from the original. Remember to check that you have the radius before using the area formula. 8cm Diameter = 8cm Radius = 8/2 = 4cm 4cm