Square in a Square

A completed block

The fifth block is composed of nine 4" Square-in-a-Square units. The central square side is the hypoteneuse and has to be measured and the"line" on the ruler estimated. Making a template would solve the problem but here I have drawn nine 4" units on graph paper and cut them out, placed a square in the centre and added larger than needed to opposite corners, pressed and added another two and then trimmed with a quarter inch seam allowance all round.

Drawn foundations

Oversize HST's added to opposite size corners

The succeeding stages

Completed unit from the reverse

Completed units ready to piece