Question 317155
The area of the box is,
{{{Ab=L*W=(x+8)(x+4)}}}
The area of the triangle is,
{{{At=(1/2)bh=(1/2)(x+4)(2x)=x(x+4)}}}
The ratio of Triangle area to Box area is,
{{{At/Ab=((1/2)(x+4)x)/((x+8)(x+4))}}}
{{{At/Ab=(x*cross((x+4)))/((x+8)*cross((x+4)))}}}
{{{highlight(At/Ab=x/(x+8))}}}