Three right angled triangles are all that is needed to create one of these Flying Geese units (or patches.) The largest triangle piece is considered to be the "geese" piece -- (why it is not called a "goose" piece is beyond me). The other two identical triangles are considered to be the "sky" pieces.
Flying geese units are probably the third most commonly used patches in quiltmaking -- following the square and the half square triangle.
Free Quilt Block Pattern
The Art Square quilt block is a great starter for the beginner quilter. It can be made as a larger block to get the idea of how patches go together. For quilters who want more of a challenge, you could make the same block but in a smaller scale. This will really enhance the precision of your piecing skills.
The Art Square quilt block contains simple patches -- only the square and half square triangles to create those flying geese units, which are so common to many quilts.