81 square units
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15 units of measurement
The length of the diagonal of a square whose side lengths are 7 square root 2 (9.89949494) is: 14 units.
It is double the length of the base, in square units.
A right angled triangle with sides 3,4 and 5 units and a square with each side = 3 units.
Using Pythagoras' theorem it is 17 units in length