ACT Math Formulas

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Formulas to know for ACT

Math

ACT

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40 Terms

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Pythagorean theorem

a^2 + b^2 = c^2

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Circumference of a circle

C= (3.14)(d)

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Area of a circle

A=(3.14)(r^2)

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distance formula

D=(r)(t)

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arithmetic sequence formula (explicit)

an = a1 + (n - 1)d

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Sum of arithmetic sequence

S = (n/2) (a1 +(a1+(n-1)d)) or S = (n/2) (a1 + an)

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Geometric sequence formula

an=a1(r)^n-1

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Geometric Series formula Finite

Sn = a1 (1-r^n) / (1-r)

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Combination formula

nCr=n!/r!(n-r)

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Permutation

nPr=n!/(n-r)!

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parabola

y=a(x-h)^2+k

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circle

(x-h)^2+(y-k)^2

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ellipse

((x-h)^2/a^2) + ((y-k)^2/b^2)= 1

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hyperbola

((x-h)^2/a^2) - ((y-k)^2/b^2)= 1

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Inscribed angle

IA=central angle(or intercepted arc)/2

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Property of Parallelogram

Opposite sides are parallel and congruent

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opposite angles are congruent

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consecutive angles are supplementary

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diagonals bisect each other

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Property of Rectangle

4 90 degree angles

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Property of Rhombus

4 congruent sides

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Property of Square

4 90 degree angles and sides

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Property of Trapezoid

one set of parallel sides

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isosceles trapezoid

one set of parallel sides and 2 congruent sides

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trigonometry functions

a sin (b(x-c))+d

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area of trapezoid

a= (b1+b2/2)(h)

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volume of a pyramid

B(length x width) x H

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volume of a cone

(1/3)(pi)(r^2)(h)

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volume of a cylinder

(pi)(r^2)(h)

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volume of sphere

4/3(pi)(r^3)

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volume of rectangular prisim

b x w x h

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sum of angles in polygon

n=(n-2)(180)

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single interior angle

n= (n-2)(180)/n

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Trig Ratios/SOHCAHTOA

s=o/h, c=a/h, t=o/a

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Reciprocal Trig Ratios

Csc=h/o, sec=h/a, cot=a/o

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Slope formula 2 points on a line

Slope formula: 

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the slope of a line and a point on the line

Point-slope formula: y - y1 = m(x - x1)

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the slope and y-intercept of a line

Slope-intercept formula: y = mx + b

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Parallel lines have equal slopes

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The slopes of perpendicular lines are opposite reciprocals