This course is a revision of high school trigonometry and geometry. Particular importance is given to the meaning and use of functions. In this course we study the properties and graphs of the three trigonometric ratios/functions and conversion from degrees into radian measure. The reciprocal and inverse of trigonometric ratios/functions are introduced. Much of the later work consists of developing and using identities and solving various forms of trigonometric equations. In addition, the course covers solutions of quadratic equations. A mathematical approach to vectors is also given, including simple operations on vectors and the use of scalar product to find angles.