Construction of pinwheel block : 4 blocks
This block has two basic pieces to it: a triangle and a trapezoid.
Cut four 6 3/8 inch squares from the designer fabric. Cut across both diagonals for a total of four triangles from each square. You will end up with 16 triangles.
Cut four 6 3/8 inch squares from the complementary solid fabric. Cut across both diagonals for a total of four triangles from each square. You will end up with 16 triangles.
For the trapezoids you need a 2-inch length of fabric which you will subcut into 6-inch rectangles. You need a total of sixteen 2 x 6 inch rectangles. With the right side fabric facing the rotary mat, line up your ruler on the left end of the rectangle. You will make a 45- degree angle cut from the bottom left of the fabric to the upper right, with a long edge measurement of 6 inches and a short edge measurement of 4 1/8 inches.
Putting the pinwheel square together:
Lay out your completed pinwheel on a flannel board in from of you so that you can see how the pieces go together.
Click here for a larger image
Sew a light purple triangle and a designer fabric triangle together. Sew a solid triangle to a light purple trapezoid. Sew these together to make a larger unit. (See diagram above)
Repeat this process until you have four completed units that will make up the larger square. Sew these four units together, making sure the pinwheel "rotates" as you complete the block. You will need four completed pinwheel blocks. Each block will finish to 10 1/4 inches. (See diagram above)