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To find the length of d, we can use the Pythagorean theorem which states:
a^2 + b^2 = c^2
In this case, a = w = 20 in., b = h = 18 in., and c = d.
So, we have:
20^2 + 18^2 = d^2
400 + 324 = d^2
724 = d^2
d = sqrt(724)
d ≈ 26.9 in.
Therefore, the length of d is approximately 26.9 in.