Coinstruction! Coinstruction Hexagon Assembly Coinstruction!

Assembly:   Hexagon Triangle
Coinstruction!
First, we make a hexagon using Y pieces.
Coinstruction!
Next, using one edge of the hexagon you just made, start another hexagon attached to the first.
Looking at the picture, what you're doing is adding the shape in the lower right corner.   You may find it easier to add the pieces to the existing hexagon one by one, rather than making the shape in the lower right corner of the picture separately first.
Coinstruction!
Next, add the top part of the triangle to the 2 hexagons you have so far.
Looking at the picture, you're attaching the shape at the top to the double-hexagon you made.
Coinstruction!
You did it!
Now try building more hexagons off this shape.   Hexagons fill space perfectly; that is, they tesselate.   What that means is as long as your supply of Coinstruction pieces and pennies doesn't run out, you can make this thing as big as you want.