A 30 piece wooden set for learning radian measurement. Each piece is arranged in arcs with a 45 mm (1.75 in) radius. Hoops are included for ease of arranging radians together in a circle. Each hoop is 110 mm (4.3 in) in diameter. These manipulatives are a perfect learning aid for helping young children become familiar with judging radial measurements and getting used to standard radian values in mathematics. They would be great for a classroom setting, homeschooling, or tutoring.
π radians (x2)
2π/3 radians (x3)
π/2 radians (x4)
2π/5 radians (x5)
π/3 radians (x6)
π/4 radians (x8)
The pieces fit comfortably in hand and have a pleasant weight. They are laser cut from high quality 1/8" (3 mm) thick 3-ply birch plywood.
The pieces and hoops are suitable for use in their unfinished state but may also be finished. They may be painted, stained, and/or varnished without trouble. Some finish sanding will be required if you desire a very smooth surface.
When cutting wood with a laser, wooden edges are noticeably darker than the top and bottom. The darkening is fairly uniform and some people prefer the contrast. However, if you do not like the darker edges, they may be removed by sanding.