external image Circumference.jpg

The circumference of a circle is the distance around the outside of the circle. It could also be called the perimeter of the circle.
  • equation for circumference is C=2π(r) or C=diameter(π)
calculating the circumference


Calculating the Circumference of a Circle
  • The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle.
    • If a circle has a diameter of 4, its circumference is 3.14*4=12.
  • If you know the radius, the diameter is twice as large.
area of a circle

AREA
*Circle Area = π • r²

as you can tell to find area you take the radius squared and times it by pi
as you can tell to find area you take the radius squared and times it by pi

external image pi-small.jpg