2.5
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5 / sqrt(2)
Rationalise denominator
Hence
5 sqrt(2) / 2
5*1.41421... / 2 =
3.535533906....
Multiply everything by the square root of 3 minus the square root of 2 and then times that by 100 - 72 and divide that by 5
4
25
16
0.25