geometry

Math

• Area of a triangle :: $1/2\cdot h\cdot b$
• Area of circle :: $\pi r^2$
• Area of a trapezoid :: $w\cdot \frac{a+b}{2}$ (w is for the sides that are the same length)
• Area of a cylinder :: $\pi r^{2}h$
• circle w/ center (a,b) and radius r :: $(x-a{)}^2+(y-b{)}^2=r^2$