The topic of Trigonometry from the GCSE books of the Mathematics Enhancement Program. For information about these resources and an index for the whole collection please visit http://www.mrbartonmaths.com/CIMT.htm Keywords: Sine, Cosine, Tangent, Sin, Cos, Tan, Hypotenuse, Ratio, Pythagoras, Trigonometry, Right Angle Triangle, Angle, Theta, Elevation, Length, Height, Calculate, Functions, Formula, Inverse, SOHCAHTOA, Sine Rule, Cosine Rule, Reflex, Obtuse, 2D, 3D.