Excellent tut once I figured out she was using the markings on the cutting mat and not the ruler. Probably obvious to everyone but me but just in case . saved me a bunch of time and money not looking for a triangle ruler !
You will enjoy using this power point with your students! The lesson includes some of the basic terminology used when referencing isosceles triangles, and you will also find that the lesson includes important relationships to look for and to be aware of when working with both isosceles triangles and equilateral triangles.