Trigonometry Exact Values Exact values In trigonometry some values of sin, cos and tan are “nice” For example sin 30° = ½, tan 45° = 1 We can find those associated with the angles 30°, 45° and 60° ...
Radian Measure Radian measure Radians are an alternative to degrees for measuring angles 1 radian is the angle in a sector of radius 1 and arc length 1 Radians are normally quoted in terms of π Thi...
Transformations of Trigonometric Functions Transformations of trigonometric functions You should already have a good idea about translating, stretching and reflecting basic functions (see Transform...
Graphs of Trigonometric Functions Graphs of trigonometric functions The Trigonometric Functions Sin, Cos and Tan all have special periodic graphs that you need to be able to sketch and remember You...
Non-Right-Angled Triangles What do I do if there isn’t a right‑angle? The Sine Rule, Cosine Rule and Area Formula can be used for ANY type of triangle They can help us calculate missing side length...
Right-Angled Triangles What is SOHCAHTOA? SOH, CAH, and TOA are an easy way to remember the three basic trigonometry ratios They show the relationship between an angle and the different sides of a ...
Trigonometry - Definitions What is trigonometry? Trigonometry looks at the relationship between side lengths and angles of triangles It comes from the Greek words trigonon meaning ‘triangle’ and me...
Radius & Tangent What is the relationship between tangents and radii? A tangent is a line that touches a circle at a single point but doesn't cut across the circle A tangent to a circle is perp...
Angle in a Semicircle What is the angle in a semicircle property? It is always possible to draw a unique circle through the three vertices of a triangle – this is called the circumcircle of the tri...
