May not need these for many games, but they’re handy to have in one spot.
Rectangle
\(\large \mbox{area} = b \times h\)
Square
\(\large \mbox{area} = s^2\)
Parallelogram
\(\large \mbox{area} = b \times h\)
Trapezoid
\(\large \mbox{area} = \LARGE\frac{b_1 + b_2}{2} \large\times h\)
Circle
\(\large \mbox{area} = \pi \times r^2\)
Triangle
\(\large \mbox{area} = \LARGE\frac{b \times h}{2}\)
Equilateral Triangle
\(\large \mbox{area} = \LARGE\frac{s^2 \sqrt3}{4}\)