Opposite angles of a cyclic quadrilateral

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Other lessons in this sub-strand

1. Arc, chord and segment
2. The angle an arc subtends
3. The centre angle is twice
4. The angle on the other arc
5. Angles in the same segment
6. Both segments of one chord
7. The angle in a semicircle
8. Equal radii, equal base angles
9. Opposite angles of a cyclic quadrilateral
10. The exterior angle
11. Choose the circle theorem
12. A window, a wheel and a seat