I just finished this book - Singapore Math 6B.
Rate = Distance / Time
Circumference = Π * Diameter
Area of a Circle = Π * Radius2
Area of a Semi-Circle = .5 * Π * Radius2
Area of a Quadrant(of a Circle) = .25 * Π * Radius2
Volume of a Box = Width * Length * Height
Volume of a Cube = Side3