QuickCalci Formulas

Circle Area — Worked Examples

Five real-world examples demonstrating the Circle Area formula (A=πr²).

1

Small Coin (r = 1 cm)

Area of a typical coin

Inputs
r 1
Result
A 3.1416
Try this example →
2

Dinner Plate (r = 15 cm)

Standard plate coverage

Inputs
r 15
Result
A 706.8583
Try this example →
3

Swimming Pool (r = 5 m)

Circular pool area

Inputs
r 5
Result
A 78.5398
Try this example →
4

Radar Coverage (r = 50 km)

Air traffic radar sweep zone

Inputs
r 50
Result
A 7853.9816
Try this example →
5

Large Pizza (r = 15 cm)

How much pizza fits on a 30cm round tray

Inputs
r 15
Result
A 706.8583
Try this example →