This is a 6 inch diameter Geometry manipluative that can be useful in the teaching and learning about the properties of angles, inscribed angles, central angles, and arc lengths and measures. Use with a rubber band or two to discover the relationship between inscribed and central angles . Holes around circumference are spaced at 15 degree intervals, with a total of 24 lines equally radiated around the center.
If planning on using this to complement lessons on the subject, print a classroom set so each student can explore, or at least print enough so that each table group can share one.
Additional materials needed:
- rubber bands
- 25 small nails ( i used some 5/8" nails I had in my workshop - see photo) to tap into holes (24 around edge and one in center)
If you like this object, check out the customizable version I created at:
I printed this at 0.1 mm resolution because the the nail hole diameter is so small. It resulted in a longer print time, but the result was a good print with holes that hold the nails perfectly.