
Victoria V. answered 04/17/19
20+ years teaching Algebra 2 subjects & beyond.
Each side length is the distance between its vertices (the given coordinates).
So find the distance (d = sqrt[ (x2-x1)2+(y2-y1)2 ] )
between (0,0) and (5,2)
d = sqrt(52+22) = √29
between (5,2) and (3,7)
d = sqrt( (-2)2+ 52) = √29
between (3,7) and (-2,5)
d = sqrt( (-5)2 + (-2)2 ) = √29
between (-2,5) and (0,0)
d = sqrt ( 22 + (-5)2) = √29
Since all of these distances are √29, the answer is that the
length of one of the sides is √29