ACT Math Formulas

midpoint

midpoint

add them together and divide by two

distance

√(x-x)²- (y-y)²

slope

rise/run

slope-intercept

y=mx+b

point slope

y-y1=m(x-x1)

circle

(x-h)²+(y-k)²=r²

ellipse

((x-h)²/a²)+((y-k)²/b²)=1

volume of a cube

V=s³

volume of a rectangular prism

V=lwh

volume of triangular prism

V=1/2lwh

volume of cylinder

V=πr²h

volume of cone

V=1/3πr²h

volume of a sphere

V=4/3πr³

area of square

area=s²

area of rectangle

area=lw

area of triangle

area=1/2bh

area of trapezoid

1/2(b1+b2)*h

surface area of rectangular prism

area=2lw+2wh+2lh

circumference of a circle

2πr

degrees to radians

180°=1 radian

similar triangles

same angles different side lengths