This product contains 40 flash cards plus two reference cards that help students master radius vs. diameter of a circle. These flash cards include circles with a radius, circles with a diameter, circumference formulas, and some real world images. They are ready to print, laminate, cut, and use for years to come! This product also includes a digital version using google slides, which you can share with your students for independent practice or work together in class for a quick check for under