Flashcards: Common math formulas

sum/total number

πr²

2πr

circumference(central angle/360)

area(central angle/360)

A = P (1 + r/n)^ (nt) A = accumulated amount P = principle r = interest rate expressed as decimal n = compounding per period t = number of periods

y = C(1+r)^t y = final amount C = initial amount r = rate of change t = time

y = C(1-r)^t y = final amount C = initial amount r = rate of change t = time

(1/3)πr²h

πr²h

2πrh+2πr²

lwh

2lw+2lh+2wh

(1/3)lwh

(4/3)πr³

(x-h)² + (y-k)² = r² h = x coordinate of the centre point k = y coordinate of the centre point

ax² + bx + c

x = [-b ± √(b² - 4ac)}/2a

Bh

2b + 2h

A = (b1+b2)½h

(n-2)180

one part/another part

one part/whole part = one part / whole part

desired outcomes/total outcomes

½bh

a²+b²=c²

m = rise/run m = ∆y/∆x m = (y₂-y₁)/(x₂-x₁)

y=mx+b

change/original