##sample problem
DOCUMENT();
loadMacros( "PG.pl", 
	        "PGbasicmacros.pl",
	        "PGauxiliaryFunctions.pl",
	        "PGchoicemacros.pl",
	        "PGanswermacros.pl",
);

TEXT(beginproblem());

$showPartialCorrectAnswers = 1;
$showHint =0;


$fx = random( 5.05   , 6.0   , 0.02   )   ; 
$fy = random( 7.07   , 8.0   , 0.02   )   ;   
$ansxy = sqrt($fx * $fx  + $fy * $fy); 
$anscm = $ansxy*100;  

BEGIN_TEXT
This problem demonstrates how WeBWorK handles 
numerical answers involving units.  WeBWorK can handle all units that
are used in elementary physics courses.
See \{ htmlLink("http://webwork.math.rochester.edu/phy121/help_units.html","answers with units") \}  
for more details. $PAR

Two perpendicular sides of a triangle are $fx m and
$fy m long respectively.  
What is the length of the third side of the triangle?$BR$BR
You can answer this in terms of m's, cm's, km's, in's, ft, etc. but you must enter the units. $BR$BR
Check "Show Hint" and then "Submit Answer" if you don't remember the Pythagorean theorem.
END_TEXT

HINT(EV2(<