Area of a circle
You learn to work out the area of a circle.
How to work it out
- Multiply radius by itself: r × r.
- Multiply that by π (approximately 3.14).
A circle has radius 3 cm. What is the area?
- Radius times radius times π: 3 × 3 × 3.14 = 28.26.
- The area is about 28.3 cm².
Another example
A circle has radius 5 m. What is the area?
- Radius times radius times π: 5 × 5 × 3.14 = 78.5.
- The area is about 78.5 m².