GCSE Maths (Edexcel)

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Constructing a Triangle

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Geometry and Measures Properties and Constructions

Constructing a Triangle

2:36 Compass Constructions
Spec G2
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  • To construct a triangle with three given side lengths, you will need a pair of compasses, a pencil, and a ruler.
  • Start by drawing the longest side of the triangle using a ruler.
  • Open the compasses to the width of another side length and draw an arc from one end of the line.
  • Repeat the previous step on the other end of the line, but with a compass separation of the last side length.
  • The arcs should intersect the original arc.
  • Finally, join the intersection of the arcs with the ends of the longest line to complete the triangle.
  • Make sure to use a sharp pencil for neat construction lines.

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