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References to 'circumferential angle is half the corresponding central angle'
1. angle of view of a line segment by pahio
2. center of gravity of circular sector by curious
3. circular segment by pahio
4. construction of regular $2n$-gon from regular $n$-gon by Wkbj79
5. construction of tangent by pahio
6. cyclometric functions by pahio
7. opposing angles in a cyclic quadrilateral are supplementary by rm50
8. power of point by PrimeFan
9. proving Thales' theorem with vectors by pahio
10. radian by PrimeFan
11. regular decagon inscribed in circle by pahio
12. sector of a circle by CWoo
13. similarity in geometry by pahio
14. trigonometry by rm50