• Trigonometric circle, degrees & radians, complementary & supplementary angle
• Pythagoras theorem, demonstration and exersises
• Arc length and Area of a sector
• Eratosthenes
• Problem involving arc length and sectors
• Some trigonometric identities
• Exersises about identities
• Curves of the trigonometric functions
• Sine Theorem and Cosine Theorem
• Problems 1 & 2
• Problems 3, 4, 5 & 6

http://wikipedia.org/wiki/Prosthaphaeresis