Didrafters at Scales 1 and 5
A didrafter is made by joining two 30°-60°-90°
triangles along equal edges, where the halves of a triangle's hypotenuse
may be used separately.
A didrafter is proper
if it can be placed on a polyiamond grid
so all its edges lie on the edges and medians of the grid cells.
Otherwise it is improper
There are 13 didrafters, 6 proper and 7 extended.
They have 26 cells in all.
Here I show how to tile each of 5 didrafters at scales 1 and 5,
using a double set of didrafters.
The solutions are not unique.
Last revised 2021-02-20.