Polygon ABCD goes through a sequence of rigid transformations to form polygon A'B CD. The sequence of transformations involved is a reflection across they-axis followed by reflection across the line

so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130

whew you’re speaking a different language