PSAT Prep(Math)-Math Formulas

area of circle

πr²

area of parallelogram

bh

area of rectangle

lw

area of square

s³

area of trapezoid

½h(b1+b2)

area of triangle

½bh

axis of symmetry

x=-b/2a

circumference

2π²

density

m/v

direct variation

y=kx

distance (travel)

d=rt

fahrenheit

9/5•C+32

inverse variation

y=k/x

length of diagonal rectangle

√l²+w²+h²

percent decrease

old-new/old

percent increase

new-old/old

perimeter of square

4s

perimeter of rectangle

2(l+w)

point-slope formula

y-y1=m(x-x1)

pythagorean theorem

a²+b²=c²

standard form

ax²+bx+c

vertex form

y=a(x-h)²+k

simple interest

i=prt

slope

y2-y1/x2-x1

slope intercept

y=mx+b

standard form (line)

ax+by=c

surface area of cube

6s²

volume of cube

s³

volume of cone

1/3πr²h

volume of rectangle

lwh

difference of squares

x²-y²=(x-y)(x+y)

population density

population/area

probability

favorable outcomes/total outcomes

cosecant

hypotenuse/opposite

cosine

adjacent leg/hypotenuse

cotangent

adjacent leg/opposite leg

distance formula

√(x2-x1)²+(y2-y1)²

midpoint

(x1+x2/2 , y1+y2/2)

sum of interior angles of polygon

(n-2)180