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- 1. Angle Theorems
- 2. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference.
- 3. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. C A B O
- 4. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. C A B O
- 5. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. C A B O
- 6. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. Proof: Join BO and produce to X X C A B O
- 7. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. Proof: Join BO and produce to X X C A B O
- 8. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. Proof: Join BO and produce to X X C A B O
- 9. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. Proof: Join BO and produce to X X C A B O
- 10. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. Proof: Join BO and produce to X X C A B O
- 11. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. Proof: Join BO and produce to X X C A B O
- 12. Angle Theorems (4) The angle subtended by an arc (or chord) at the centre is double the angle subtended by the arc (or chord) at the circumference. Proof: Join BO and produce to X X C A B O
- 13. (5a) The angle in a semicircle is a right angle.
- 14. (5a) The angle in a semicircle is a right angle. A B O C
- 15. (5a) The angle in a semicircle is a right angle. A B O C
- 16. (5a) The angle in a semicircle is a right angle. A B O C
- 17. (5a) The angle in a semicircle is a right angle. A B O C
- 18. (5a) The angle in a semicircle is a right angle. Proof: A B O C
- 19. (5a) The angle in a semicircle is a right angle. Proof: A B O C
- 20. (5a) The angle in a semicircle is a right angle. Proof: A B O C
- 21. (5a) The angle in a semicircle is a right angle. Proof: Exercise 9B; 1 ace etc, 2, 6, 8ac, 9ab, 10ac, 11ac, 12, 13 A B O C

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