"Thanks a lot.
I don't find the way to draw here.
That corral must be ractangular and three sides without side of barn.please reply again. endria"
Please don't PM in that manner; POST instead.
If your corral must be rectangular with the barn being one side,
why didn't you say so right off the bat?
barn side = b (so another side has to equal b);
that leaves (195 - b) / 2 as the other 2 sides.
So area = b * [(195 - b) / 2] = (195b - b^2) / 2
Maximums (or minimums) don't apply here: if they do,
then something wrong with your question.
Like, how do you expect an actual value as answer when
we don't know the length of barn's side?