http://www.vbforums.com/showthread.php?559659-Sqr-And-Sqrt&p=3458105#po…
# SQR
The square function returns the square (ie the argument multiplied by itself) of its supplied argument,
SQR( 2 ) returns 4
# SQRT
This function returns {always returns a real} the square root of its argument, eg,
SQRT( 4 ) returns 2.0000000000E+00