## Content description

Investigate the relationship between features of circles such as circumference, area, radius and diameter. Use formulas to solve problems involving circumference and area (ACMMG197)

### Elaborations

- investigating the circumference and area of circles with materials or by measuring, to establish an understanding of formulas
- investigating the area of circles using a square grid or by rearranging a circle divided into sectors

Source: Australian Curriculum, Assessment and Reporting Authority (ACARA)

## Definition of a circle

A **circle** is the path traced out by a point, moving in a plane, that is always a fixed distance (the radius) from a fixed point (the centre).