formulas

area of a square using diagonals

area of a square using diagonals

(d^2)/2

area of a square

s^2

area of a rectangle

lw

perimeter of a square

4s

perimeter of a rectangle

2(l+w)

arithmetic sequence

an=a1+(n-1)d

sum of arithmetic sequence using first and last term

sn=n/2(a1+an)

sum of arithmetic sequence

sn=n/2(2a1+(n-1)d)

geometric sequence

an=a1r^n-1

sum of geometric sequence

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

area of a circle

πr²

surface area of a circle

4πr²

volume of a circle

4/3πr³

area of a parallelogram

a=bh

area of a triangle

a=bh/2

30-60-90 triangle

s-s√3-2x

surface area of a cylinder

2πrh+2πr²

volume of a cylinder

πr²h