| A | B |
| Formula for circumference when u know the diameter of a circle | pie x diameter |
| Formula for diameter when u know the radius of a circle | radius x 2 |
| Formula for diameter when u know the circumference of a circle | circumference divide by pie |
| Formula for the area of a circle when u know the radius | pie x radius squared |
| formula for area of a square or rectangle | height x base |
| Formula for semi-circle | pie x radius squared divide by 2 |
| Formula for 1/4 of a circle | pie x radius squared divide by 4 |
| formula for circumference when u know the radius | radius x 2 then x pie |