Hello, ViresArcanum!

Is there more information?

As stated, there is no unique solution.

i've been trying to calculate the perimeter of a parallelogram

by only knowing the length of the diagonals (which are 7 and 9 units).Code:S R * - - - - - - - - * / * * / / * O * / / * / b / 4½ * θ * 3½ / / * * / * - - - - - - - - * P a Q

We have parallelogram with diagonals

. . intersecting at

Law of Cosines: .

. . Hence: .

It can be shown that: .

Hence, the perimeter, , is a function of , not a constant.