Question 946934
{{{4/5=X/Y}}}
So then, 
{{{4Y=5X}}}
{{{Y=(4/5)X}}}
Since it's a parallelogram,
{{{X+Y+Y+X=360}}}
{{{X+Y=180}}}
{{{X+(4/5)X=180}}}
Now solve for {{{X}}}.
Then go back and solve for {{{Y}}}