Physics- radius, diameter

[lDanny]

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I was review TPR, when there is an equation with a circular cross-section, they say square of the radius or diameter. Should it just be radius? Thanks in advance

 

[Bernoull]

won't circular cross-section be just area of a circle pi*r^2. U can use diameter but the eq will be pi*0.25d^2

 

[Baylor83]

I was review TPR, when there is an equation with a circular cross-section, they say square of the radius or diameter. Should it just be radius? Thanks in advance

If you have a ratio of 2 different areas, it wouldn't matter whether having the radius or the diameter squared.