ਰੇਡੀਅਸ: ਰੀਵਿਜ਼ਨਾਂ ਵਿਚ ਫ਼ਰਕ

[http://www.mathwords.com/r/radius_of_a_circle_or_sphere.htm Definition of radius] at mathwords.com. Accessed on 2009-08-08.</ref>

: <math>d \doteq 2r \quad \Rightarrow \quad r = \frac{d}{2}.</math>

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