GCSE Maths (Edexcel)

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General Area of a Triangle

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Geometry and Measures Mensuration and Calculation

General Area of a Triangle

3:30 Triangle Rules
Spec G1 G23
Previous The Cosine Rule Next Introduction to Vectors
  • The area of a triangle can be calculated without knowing the height
  • The formula for the area of a triangle is a half base times height
  • If the height is unknown, the formula can be a half times AB sine C
  • AB and C represent the sides and angle of the triangle
  • The formula is derived from a right angle triangle with a given angle C
  • The formula can be simplified to a half base times height
  • The formula is a half times AB sine C
  • An example is given to practice using the formula
  • The area of the scalene triangle in the example is 30 centimeters squared

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