Pi

g

À 3.141592653590 for calculations.

À 3.141592654 for display.

Example

À

2 V g <

 

r

Note: Classic mode displays calculations with À as a decimal approximation.

³ Problem

What is the area of a circle if the radius is 12 cm?

Reminder: A = Àr2.

g V 12 G 2 <

r

The area of the circle is 144 À square cm. The area of the circle is approximately 452.4 square cm when rounded to one decimal place.