If you cut 2 large squares right sides togather, use 6 in sqs for 2 1/2 in triangles and 8 in for 3 1/2 in triangles.
Draw lines from corner to corner both ways and sew 1/4 in down each side of lines- looks like an x.
Then cut the block in half both ways then on the lines. You will have 8 triangles and they are not on the bias.
Your triangles will need to be squared up slightly using Quilt in a Days square up ruler which only requires ONE cut.
The way some do it by sewing around the outside of the block all your triangles will be on the bias.