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# 圣公会中学 - PowerPoint PPT Presentation

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Anglican High School

Methodology

Class Demonstration

### Laboratory Sessions

 Heymath!  Sec 3 Additional Maths  circular measure  Example

The diagram given below shows part of a circle with center O and radius r cm

1. Write down the relation between arc length PQ, r and POQ

2. From the above relation, calculate the value of r

3. Now consider the arc QR.

Which of the following relations is correct?

Arc length QR  r × QOR

QOR  arc length QR × r