Question 166597
sure.
if you know the other 2 parameters.
-----
example:
p = 100
l = 5
w = ?????
-----
formula for perimeter is p = 2*l + 2*w
substitute 100 for p and 5 for l and you get:
100 = 2*5 + 2*w
this becomes
100 = 10 + 2*w
this becomes
90 = 2*w
this becomes
45 = w
-----
manipulation of the formula for p itself without using any values for any of the variables will show you how.
-----
the formula for perimeter is {{{p = 2*w + 2*l}}}
subtract 2*l from both sides:
{{{p - 2*l = 2*w}}}
divide both sides by 2:
{{{(p - 2*l) / 2 = w}}}
-----
the formula for w as a function of the perimeter and the length is:
{{{w = ((p-(2*l))/2)}}}
it was derived from the formula for perimeter.
-----