You will be able to cut perfect Isosceles and Right Triangles using this Bigz Pro Quilting die from Sizzix. This die will help you create triangles that measure 3 1/2" x 6 1/2" and 6 3/4" x 6 1/2". No measuring is needed. Line up your fabric with the cut blades, not the edge of the die, and run it through a Big Shot Pro machine with a set of Extended Big Shot Pro Cutting Pads (all items sold separately). Overall, this die measures 12" x 12 3/4". It's the largest die that Sizzix makes. It can be used to cut a wide variety of materials, including fabric, foam, leather, magnet, chipboard, cardstock, paper, and more.