Question 343469
NEED TO KNOW:
AREA OF A RECTANGLE = L*W
QUESTION STATES THE FOLLOWING TO BE TRUE
{{{L=5(W)}}} AND THAT THE AREA IS {{{245cm^(2)}}}
SUBSTIUTE FOR L IN AREA FORMULA: {{{L*W=245cm^(2)}}}
{{{5(W)(W)=245cm^(2)}}}
{{{5W^(2)=245cm^(2)}}}
SIMPLIFY:
DIVIDE BOTH SIDES OF THE EQUATION BY 5
{{{W^(2)= 49cm^(2)}}}
{{{W=highlight(7cm)}}}
{{{L=5(7)}}}
{{{L= highlight(35cm)}}}  
PERIMETER IS THE TOTAL LENGTH OF ALL SIDES
{{{PERIMETER= 7+7+35+35}}}
{{{PERIMETER=highlight(84cm)}}}