Circles
Area of a circle = 
Circumference of circle = C = 2
Equation of a circle = 
Equation of an ellipse = 
Triangles
Area of a triangle = A = 
3d Shapes
Cube
Surface area of a cube = 
(a is the length of the edge)
Cylinder
Surface area of a cylinder = 
(r = radius of circular base, h = height of cylinder)
Sphere
Surface area of a sphere = 
Hemisphere
Surface area of a hemisphere = 
Parabola
Equation of a parabola =
(h,k) denote the point position
Parallelogram
Area of a parallelogram = 
Rectangle
Area of a rectangle =
Square
Area of a square = 
Trapezoid
Area of a trapezoid = 