The base.
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It is the median which divides the side which is not one of the equal sides.
What is the length of a leg of an isosceles right triangle if it is area is 72 square inches?
12!!
Each leg works out as 9.998489886 to comply with Pythagoras' theorem for a right angle triangle.
The two legs that are congruent can be called x and x respectively, while the third non-congruent leg is ?2