Math

Cherry Pie / Apple Pie

Cherry Pie's Delicious, Apple Pie's Are Too

Helps you remember the circle circumference and area formulas.

✨ Tap to flipCherry Pie's Delicious, Apple Pie's Are Too

When to use it

Use it to recall whether to use diameter or radius when setting up a circle problem.

Example

For a circle with diameter 10 cm, circumference is $C = \pi d = 10\pi$ cm. For radius 5 cm, area is $A = \pi r^2 = 25\pi$ cm².

Common mistake

Using radius in the circumference formula or diameter in the area formula. Cherry Pie uses diameter, Apple Pie uses radius squared.