SAT Subject Test Mathematics Level 1

(Marvins-Underground-K-12) #1
Circumference   =   πd

In the circle above, the radius is 3, so the circumference is 2π(3) = 6π.


FOUR CIRCLE FORMULAS


Circumference   =   2πr =   πd

Length  of  an  

Area    of  a   Circle  =   πr^2

Area    of  a   

Length of an arc: An arc is a piece of the circumference. If n is the degree
measure of the arc’s central angle, then the formula is:

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