GCSE Maths (Edexcel)

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Exact Trigonometric Values

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Geometry and Measures Mensuration and Calculation

Exact Trigonometric Values

11:05 Trigonometric Calculations
Spec G21
Previous Pythagoras' Theorem Next Using the Trigonometric Functions
  • Trigonometric functions for angles of 30 degrees and 60 degrees can be written in terms of simple roots
  • To find the length of the missing third side of a right angle triangle, use Pythagoras theorem
  • Trigonometric ratios can be applied to the angles in the triangle to find their exact values
  • Sine theta is opposite over hypotenuse, cos theta is adjacent over hypotenuse, and tan theta is opposite over adjacent
  • Trigonometric values are exact for any size of triangle
  • The same process can be applied for an angle of 45 degrees using an isosceles right angle triangle
  • Sine, cos, and tan of 0 and 90 degrees have specific values (0, 1, 0 and 1, 0, undefined respectively)
  • Knowing the exact trig values can be useful for remembering the values

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