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Formulas for the ACT
Formulas that are good to know for the ACT, such as area of various polygons and the distance formula
10
Mathematics
12th Grade
06/10/2009
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Cards

Term
area of a triangle
 Definition
1/2 base x height
Term
area of a circle
 Definition
pie x r2
Term
circumference of a circle
 Definition
pie x diameter
Term
the distance formula
 Definition
√[(x2 - x1)2 + (y2 - y1)2]
Term
the midpoint formula
 Definition

x2 - x1  ,  y2 - y1

2           2

 
Term
how to find the slope of a line
 Definition

y2 - y1

x2 - x1

 

 
Term
area of a cylinder
 Definition
pie x r2 x height
Term
area of a trapezoid
 Definition
1/2 (b1 +b2) h
Term
sum of an arithmatic series
 Definition
Sn = n/2 [2a+(n-1)d]
Term
convert logarithmic form to exponential form
 Definition
y = logbx is equivalent to x = by
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