AC9M7M03Year 7MeasurementPractised on site

AC9M7M03 — Year 7 Measurement

Official Curriculum Content Description:

describe the relationship between \(π\) and the features of circles including the circumference, radius and diameter

Worked Examples (1)

Example 1Circle Circumference, Area & Pi

A circular table has a circumference of

81.64\text{ cm}

. Using

\pi \approx 3.14

, calculate its radius in cm. (Round to 2 decimal places if necessary; enter number only)

Common mistake: Confusing radius with diameter in circumference or area formulas

Correct Answer:

13.00

Worked Solution:

Rearrange the circumference formula

C = 2\pi r

for the radius:

r = \frac{C}{2\pi} = \frac{81.64}{2 \times 3.14} = 13\text{ cm}

Work through unlimited interactive questions for this curriculum skill, with instant answers and step-by-step methods.