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===Meaning===
The '''radius''' is the distance between the centre of a circle and its circumference.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/1782945970/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945970&linkCode=as2&tag=nrjc-21&linkId=a120d24dcc7cc7a58192069a3aafc1d2 ''Radius (orbits), page 321, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA '']