You can
put this solution on YOUR website!Let second leg be x metres
so first leg is 250+x
and third leg is 250+x-100 --> 150+x
so, perimeter is 250+x + x + 150+x = 2500
--> 400 + 3x = 2500
3x = 2100
x = 2100/3
x = 700m
So, first leg = 950m
second leg = 700m
third leg = 850m
and CHECK!
950+700+850 should equal 2500
--> it does! so correct
jon.