Multiple Choice

A landscape designer is calculating the exact area of a rectangular stone patio with dimensions $6\sqrt{2} feet and $3\sqrt{10} feet. The calculation yields the intermediate result $18\sqrt{20}$. To simplify the square root of 20, the designer must identify its perfect square factor. Which of the following is the perfect square factor of 20 that allows for further simplification?

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Updated 2026-04-20

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