A foldable that covers the different segment relationships that exist in a circle: Two Tangents, Two Secants, Two Chords, and Secant-Tangent. The formula for how the parts of the segment relate is given in words, as well as a simplified "equation" with words. For example:
For two secants it states, "If two secants intersect outside the circle, then the product of the measures of the outside part and the whole segment is equal to the product of the outside part and whole segment of the other secant." Then the simplified equation says "(outside)(whole) = (outside)(whole)"
For each segment type, there is also a blank circle where an example can be given.
When using, make sure to print double sided (flipping on long edge) and then cut out around the outer edge. You can then cut to create flaps between the four segment types or leave them all together.