Calculators Welcome to the calculator section of Pi Day, we are constantly working on new math calculators so if you have any suggestions please get in touch. Geometry Calculators Arc Length Calculator Area of a Rectangle Calculator Area of a Trapezoid Calculator Circle Calc: find c, d, a, r Circumference Calculator Ellipse Calculator Golden Rectangle Calculator Hexagon Calculator Law of Cosines Calculator Moment of Inertia Calculator Octagon Calculator Pythagorean Theorem Calculator Reference Angle Calculator Right Triangle Calculator Surface Area Calculator Volume Calculator Surface Area Calculator Volume CalculatorOther Calculators Fraction Calculator Final Grade Calculator College GPA Calculator