With its' various Modules, the NRG Engineering Calculator allows virtually any engineering calculation. These include:

Polar to Rectangular Conversion

Calculation of Curves and Spirals

Linear and Cubic Interpolation

Scalene and Right Angle Triangles

DTM or Trapezoid Areas and Volumes

Traverses

Intersections

Resections and Curve Fitting

There is even a function to Make the Tea!