Area of a square
A=s^2
Area of a rectangle
A=lw
Area of a triangle
A=1/2bh
Area of a circle
A=pieR^2
Area of a parallelogram
A=bh
Area of a trapezoid
A=(b1+b2)/h
Circumference of a circle
C=2pieR
Volume of a cube
V=s^3
Volume of a rectangular prism
V=lwh
Volume of a cylinder
V=2pieR2h
Pythagorean theorem
C^2=a^2+b^2
Equation of a line
Y=Mx+b
Equation of a circle
(x-h)^2+(y-k)^2=r^2