Today's prompt is the grim reaper. I have him gesturing, politely indicating the way… 

Mapping a world; taking another try at this. I want to walk through this step by step from a planetary circumference to surface area to triangular surfaces tiles adding up to a surface map. I need a button to reset the circumference and surface area, then a button to set a fraction of initial land or sea and add on until we have assigned all the surface area, as I have done before. I can figure out an initial area, then add areas of land or sea bordering this.