To find the length of the diagonal of a square, you can use the formula:
\[ \text{Diagonal} = \sqrt{2} \times \text{side length} \]
In this case, you're given that the side length of the square park is 700 feet. You also have the approximate value of \(\sqrt{2} \approx 1.4\).
Now, you can substitute the values into the formula:
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Calculate the diagonal: \[ \text{Diagonal} \approx 1.4 \times 700 \]
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Perform the multiplication: \[ \text{Diagonal} \approx 1.4 \times 700 = 980 \text{ feet} \]
Thus, the approximate length from one corner to the opposite corner of the square park is 980 feet.