GCSE Maths (AQA)

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Using Trig Functions in 3D

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Geometry and Measures Mensuration and Calculation

Using Trig Functions in 3D

5:50 Trigonometric Problem Solving
Spec G20
Previous Using Trig Functions in Other Shapes Next Trig Functions & the Unit Circle
  • Trig functions can be used to calculate lengths and angles in 3D shapes
  • Sine, cosine, and tangent functions are used to find ratios between sides of a right angle triangle
  • Pythagoras theorem can be used to find the third side of a triangle if the other two sides are known
  • Problems may require finding multiple triangles that share a common edge
  • Example problem involves calculating the angle between AH and the base of a cuboid
  • Step 1: Identify the values needed to calculate the angle
  • Step 2: Use Pythagoras theorem to find the unknown length
  • Step 3: Label the triangle and identify which trig function to use
  • Step 4: Use the inverse trig function to calculate the angle

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