Verified Answer :

For a rectangle:
\(A = w*l\)
Since A = 864, and W = 2/3L:
\(W = \frac{2}{3}L\)
\(864=L* \frac{2}{3}L\)
\(864 = \frac{2}{3}L^{2}\)
\(1296=L^{2}\)
\(\sqrt{L^{2}} = L = 36\)
Hope that helps! :)

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