Henry Ernest Dudeney/Modern Puzzles/130 - Mr. Grindle's Garden

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Modern Puzzles by Henry Ernest Dudeney: $130$

Mr. Grindle's Garden
"My neighbour," said Mr. Grindle, "generously offered me, for a garden,
as much land as I could enclose with four straight walls measuring $7$, $8$, $9$ and $10$ rods in length respectively."
"And what was the largest area you were able to enclose?" asked his friend.
Perhaps the reader can discover Mr. Grindle's correct answer.

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