Mathematics GCSE
Triangle inequality
What Triangle inequality means in Mathematics GCSE, as defined for Pearson Edexcel.
Definition of Triangle inequality
Check what you remember
Read the wording for your board, then hide it and explain Triangle inequality in your own words. Rough notes are fine. This is a self-check, with no mark or grade.
Reference: Pearson Edexcel
In a non-degenerate triangle, the sum of any two side lengths is greater than the third.
Topics that use Triangle inequality
- Geometry and measures - Mensuration and calculation (Pearson Edexcel GCSE)
Related terms
- Arc
- arc length
- area and volume units
- area of a segment
- Chord
- Circumference
- Composite shapes and solids
- Congruence
Using Triangle inequality in the exam
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