Question 972794
The parallelogram could just as well be a rectangle.

Sides, the adjascent pair, could be 2x and 3x.
{{{2(2x)+2(3x)=20}}} accounts for the given perimeter.


{{{4x+6x=20}}}
{{{10x=20}}}
{{{x=2}}}


The sides are 4 and 6.