Measuring an Arc in Degrees

Questions
1

I am trying to figure out how to how to measure an arc (in degrees) on Desmos? I want to label the green arc to show my students an interactive version of Tangent-Chord Angle Theorem so show that the angle is half of the green arc it opens up to.

Thank you!

2

I used a directedAngle instead of a standard angle for the central angle, then a little finagling to get the arc measure:

https://www.desmos.com/geometry/57j0lakkpm

3

THank you so much! This is perfect

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