area of rectangle
length x width
area of parallelogram
base x height
area of triangle
base x height/ 2
area of trapezoid
height/2(base1+base2)
area of rhombus
diagonal 1 x diagonal 2 / 2
area of kite
d1 x d2/ 2
circle
pie(r) squared
sector of circle
x/360 x pie(r)squared
regular polygon
nxsxa/2