# 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*
or *extended.*
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.

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George Sicherman
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