GCSE Maths (Edexcel)

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Perimeters of Compound Shapes

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Geometry and Measures Mensuration and Calculation

Perimeters of Compound Shapes

2:56 Perimeter
Spec G17
Previous Defining Perimeter Next Defining Area
  • Compound shapes are made up of more than one simple 2D shape
  • It is useful to split up compound shapes when solving problems
  • To calculate the perimeter of a compound shape, label each side and add up the lengths
  • Sometimes lengths of sides are missing and need to be calculated
  • Example given of how to calculate missing side length by splitting shape into simpler shapes
  • Example given of calculating perimeter of compound shape
  • Step 1: Calculate missing length x
  • Step 2: Calculate missing length y
  • Step 3: Add up lengths of each side to find total perimeter

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