Question 117735


A {{{rectangular}}} picture window is {{{5 ft}}} by {{{8 ft}}}.  

If Polly wants to put a trim molding {{{around}}} the window, you need to calculate a perimeter {{{P}}} of that {{{rectangular}}} picture window in order to find out how many feet of molding should she buy.

let the lenght of window be {{{a=8ft}}}, and the width be {{{b=5ft}}}

then:

{{{P = 2a + 2b}}}

{{{P = 2 (a+b)}}}....substitute {{{a}}} and {{{b}}}

{{{P = 2 (8ft+5ft)}}}

{{{P = 2*13ft}}}

{{{P = 26ft}}}

so, Polly should buy {{{26ft}}} of molding