13 terms

ACT Math Formulas

What math formulas you need to know for the ACT
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Circle Area
pie r squared
Circle Circumference
2 pie r or pie times diameter
rectangle area
length times width
rectangle perimeter
2 times length plus 2 times width
triangle area
1/2 base times height
line equations
y=mx+b
slope
m=y2-y1/x2-x1
sin
opp/hypotenuse
cos
adja/hypot
tan
opp/adja
complementary
90
supplementary
180
pythagorean therom
a2 + b2= c2