Circumferece=pi times radius times 2 or circumference=pi times diameter
remember that radius only goes from the middle of the circle to the outside whiel the diameter goes from 1 side to the other, passing through the middle and diameter/2=radius
area=pi times radius^2
1. radius=6 circumference=pi tiimes 6 times 2=12pi in area=pi times 6^2=36pi square inches
2. radius is 3 circumfernce=pi times 3 times 2=6pi in area=pi times 3^2=9pi square units
3., the gave us diameter circumfernce=6 times pi=6pi in the radius is half of the diameter, or 6/2 or 3 area=pi times 3^2==9pi=9pi square inches
Circumference = 2 π r. being r is the radius of the circle and π is pi or 3.14. and 2 being squaring it. You can use a calculator to square it. so you square pi then times it by the radius Area = pi(3.14) times the radius and square your result
