The Online Geometric equations Calculator allows the calculation of equations related to geometric shapes. In 2D, the surface area and perimeter equations of regular geometric shapes (triangle, square, rectangle, rhombus, parallelogram, pentagon, hexagon, octagon) are available, in addition to other equations for the arc of a circle and the section of a circle. In 3D, the notions of volume, inertia and center of gravity are added to the calculation options for different prisms and pyramids as well as spherical, conical and cylindrical objects. To name a few: