Question 1044829

let sides be {{{a}}},{{{b}}}, and {{{c}}}
if two sides of a triangle have the same length,we know that {{{a=b}}} 
if the third side measures {{{2m}}} less than {{{twice}}} the common length, we have {{{c=2a-2m}}}

 the perimeter is {{{14m}}} and formula is:
{{{P=a+b+c}}}...since {{{a=b}}} and {{{c=2a-2m}}} we have

{{{P=a+a+2a-2m}}}

{{{P=4a-2m}}}

{{{14m=4a-2m}}}

{{{14m+2m=4a}}}

{{{16m=4a}}}

{{{highlight(a=4m)}}}

than {{{highlight(b=4m)}}} too

and {{{c=2a-2m}}}->{{{c=2*4m-2m}}}->{{{c=8m-2m}}}->{{{highlight(c=6m)}}}