Answer:
The side lengths are 32 units each
Explanation:
Given


Required
The side lengths and missing angles
Since JKMN is as square, then:
-- all sides are equal

Collect like terms


Divide by -2

Substitute
in



The missing angles can't be solved without an attachment.
However, if the missing angles are the angles at the edges of the square, then they measure 90 degrees each (i.e. angles at right angle)