Guest: Is this correct?
500^2+600^2=C^2
250000+360000=C^2
/610000=c^2
/610000=about 781.02
C=about 781.02
P.S. /=square root n^2=number squared
First you should have stated that 500 units and 600 units are the 2 short sides of a right angled triangle and that you want to find the third side c.
other than that it is all correct except that you have introduced the square root too early
610000=c^2
sqrt(610000)=c units
I used a little c because it is conventional to use little letters for sides and capital letters for the vertices but it doesn't really matter.
These are only little mistakes so Smarty Party gave you good feedback.
+118653 
