Write four terms of AP
a=-2
b=0

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

4.28095238095 that is the answer

is there more info provided? there is not enough information given in the problem