Doubt from Inverse Trigonometry

I'm getting 195 pi

See symmatry about diagonal

There will be 20 element along diagonal not 10.
I m also getting 195π.

sorry ,there will be 20 elements along diagonal

Sorry 100π.
Iade a mistake in not dividing by 2 .again

but answer will be100π


I seem to be making a mistake
Shouldn't it be 380*(pi/2), instead of pi/4?
(tan inverse 20 + tan inverse 1/20 = pi/2)

It will again divided by 2 because no of terms become half.
I committed same mistake.

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Can't believe I overlooked this, Thank you.