Originally Posted by

**hippy chick**

Hi all,

i'm new to all this so bear with me if i'm asking a question that has been asked before!

i'm in the second year of a maths and stats degree but i have to admit my calculus is terrible!!

i need to work out an error analysis in a triangle using partial differentiation and i'm only given the length of the 3 sides.

i know how to do the analysis but i can't figure out how to partially differentiate heros formula

area=square root (s x (s-a)x(s-b)x(s-c)) where a,b,c are the sides of the triangle and s = (a+b+c)/2

can anybody help?

p.s. i know the answer because i've put it inot maple but my lecturer wants to see it done by hand!!

thanks

Su