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