exam Maths Puzzle Numerical Ability

A farmer has 26 meters of fencing available to enclose a rectangular region. he wants the rectangular garden to have an area o 40 square meters. find the dimension of the garden.

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I've done this problem so many dfferent way that all I have done is confuse myself more and more. Please someone help me!
The question is: Determine the equation of the line. Put PQR is an isosceles triangle such that , QP=QR=13cm and the altitude PS=12cm . Find the length of PR ? PLS HELP . Thanks