degree measure
- angleGeometric measure of rotation
- protractorAngle-measuring instrument
- arcCurved line segment
- rotationTurning on an axis
- circleCurved closed shape
ninety · forty-five · acute · obtuse · right · compass · geometry · trigonometry · sine · cosine · vertex · measurement · sweep · turn · inclination · slope · tilt · bearing
- trigonometrysine, cosine, tangent, secant, cosecant
- 360 thingsfull rotation, revolution, full circle, 360 spin