GCSE Maths (Edexcel)

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Using the Trigonometric Functions

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Geometry and Measures Mensuration and Calculation

Using the Trigonometric Functions

3:27 Trigonometric Calculations
Spec G20
Previous Exact Trigonometric Values Next The Inverse Trigonometric Functions
  • Trigonometric functions can be used to calculate the lengths of sides in a right angle triangle
  • The trigonometric functions are sine, cosine, and tangent
  • The function to use depends on which side we want to calculate and the information given about the triangle
  • The hypotenuse is the longest side and is always opposite the right angle
  • The side next to the angle is called the adjacent side
  • The side opposite the angle is called the opposite side
  • An example is given with an angle of 30 degrees and a side length of 10 centimeters
  • To calculate the length of the hypotenuse, the cosine function is used
  • The equation is rearranged to solve for the hypotenuse
  • The given values are inputted into the equation
  • The hypotenuse is calculated to be 11.5 centimeters to three significant figures

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