Transparent PNG images of radian protractors to print out on acetate and use to measure angles, or embed them within presentations.
Two variants included to suit your style of teaching. Markings are either unit fractions of a half turn or fractions of pi.
Students work with degrees for a decade but only a few months with radians. I use these to help students build confidence with radians, in particular, estimating angles in degrees and radians, then measuring to determine accuracy.
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