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OB ACT Math 1
Basic Formulas to Know on ACT Math
19
Mathematics
12th Grade
10/08/2012
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Term
Perimeter
 Definition
Add up all sides on figure
Term
Area of Square (or Rectangle)
 Definition
Length x Width
Term
Area of a Right Triangle
 Definition
1/2 x Base x Height
Term
Volume
 Definition
Length x Width x Height
Term
Finding Slope
 Definition

y2-y1

x2-x1 
Term
Slope - intercept form
 Definition
y = mx + b

m = slope
b = y intercept
Term
parallel lines
 Definition
same slope
Term
Perpendicular Lines
 Definition
slopes are negative reciprocal
Term
"Congruent" Angles
 Definition
angles that have the same measure
Term
Complimentary Angles
 Definition
Add up to 90 degrees
Term
Supplemental Angles
 Definition
Add up to 180 degrees
Term
Distance
 Definition

d = √[(x1-x2)2+(y1-y2)2]
Term
Area of a Circle
 Definition
∏r2
Term
Equation of a Circle
 Definition

(x-h)2+(y-k)2=r2

 

Center at (h,k)

Radius = r
Term
sinΘ
 Definition

opposite side

hypotenuse

 
Term
cosΘ
 Definition

adjacent side

hypotenuse

 
Term
tanΘ
 Definition

opposite side

adjacent side

 
Term
Law of Cosines
 Definition
b2=a2+c2-2ac(cosB)
Term
pythagorean theorem
 Definition

a2+b2=c2

 

used to find lengths of sides

a,b = legs

c = hypotenuse
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