Question 179341
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Edwin's solution:
It is not necessary to change everything to
inches first as Alan did.
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How do I find the perimeter of a rectangle that has a lenth of 3 ft 9in and a width of 3ft 4in?
<pre><font size = 4 color = "indigo"><b>
{{{drawing(300,300,-1,5,-1,5, rectangle(0,0,3+9/12,3+4/12),
locate(1.5,-.1,3ft9in), locate(1.5,3.7,3ft9in),
locate(-.98,1.7,3ft4in), locate(3.9,1.7,3ft4in)

 )}}}

Perimeter means "the sum of all four sides".
So we add up all four sides:

LEFT SIDE   =  3 ft  4 in
TOP SIDE    =  3 ft  9 in
RIGHT SIDE  =  3 ft  4 in
<u>BOTTOM SIDE =  3 ft  9 in</u>
TOTAL       = 12 ft 26 in

Now change only the 26 in to 2 ft 2 in

then 12 ft 26 in becomes

     12 ft + 2 ft 2 in which becomes

     14 ft 2 in.

Edwin</pre>