a) if the scale 1: 1000 we have this T = [((sqrtA) + 1)^ 2) - A] * [ L/( 4*(sqrtA)]
b) if the scale 1: 5000 we have this T = [((sqrtA) + 4)^ 2) - A] * [ L/( 4*(sqrtA)]
something is wrong here because
for A=266.50sqm and L=66.18 m calculate a) T=8.526 and the correct is T = 34.10
b) T=37.144 and the correct is T = 148.58
here is the code
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How are you determining your scale (1:1000 vs. 1:5000)?
As I mentioned at the bottom of this post, I could only speculate that you were using Annotative Scale... Perhaps you're using DimScale?
In any event, without knowing which scale to check for the two specific values you requested, there's no way to ensure that the calculation is accurate.
more information is needed, so that we're not confused.