Trigonometry
Maths: Edexcel A Level Pure Maths, topic 5.2.3
Trigonometry
Sin, cos and tan relate an angle and two sides in a right-angled triangle.
Formula triangles
- Formula triangles can be used to remember the ratios (SOHCAHTOA) and to rearrange the ratios so they can be used.
- The side opposite the angle being used is referred to as the ‘opposite’ and the side next to the angle being used is called the ‘adjacent’.
Sin
Cos
Tan
Test yourself on Trigonometry
For opposite ÷ adjacent, which trig function should we use?
For opposite ÷ hypotenuse, which trig function should we use?