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GCSE Mathematics · key term
The non-negative number which, when squared, produces a given non-negative number; for example, .
Used by Edexcel and OCR
Specification G20 · Paper 1, Paper 2, Paper 3
Revise: Pythagoras' TheoremThe equation compares squared lengths. It says that the area of a square drawn on one shorter side plus the area of a square drawn on the other shorter side equals the area of a square drawn on the hypotenuse. This is why the equation contains squares and why a square root is needed to recover an ordinary length.
Specification 3.01b · Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Foundation), Paper 4 (Higher), Paper 5 (Higher), Paper 6 (Higher)
Take the square root at the end: the result before this is the square of the missing length, not the length itself.
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A root whose degree is 2. The symbol denotes the non-negative square root of .
If no degree is shown, it is a square root.