* {{Parameter|x}} and {{Parameter|y}} are the floating point values corresponding to the legs of a right-angled (90 degree) triangle for which the hypotenuse is computed.
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* The function returns what would be the square root of the sum of the squares of x and y (as per the Pythagorean theorem).
* The hypotenuse is the longest side between the two 90 degree angle sides
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''Example:''
{{CodeStart}} '' ''
{{Cl|DIM}} leg_x {{Cl|AS}} {{Cl|DOUBLE}}, leg_y {{Cl|AS}} {{Cl|DOUBLE}}, result {{Cl|AS}} {{Cl|DOUBLE}}