AC9M8M03Year 8MeasurementPractised on site

AC9M8M03 — Year 8 Measurement

Official Curriculum Content Description:

solve problems involving the circumference and area of a circle using formulas and appropriate units

Worked Examples (1)

Example 1Circumference & Area of Circles

A circle has a radius of

11\text{ mm}

. Calculate its area. Give your answer to 1 decimal place.

Common mistake: Using the circumference formula

2\pi r

instead of area (

69.1\text{ mm}^2

Correct Answer:

380.1\text{ mm}^2

Accepted: A unit is optional (mm^2, mm², sq mm all accepted).

Worked Solution:

1. Formula:

A = \pi r^2

. 2. Substitute

r = 11

A = \pi \times 11^2 \approx 380.1\text{ mm}^2

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