Discussion
A man walked 20 m to cross a rectangular field diagonally. If the length of the field is 16 m, find its breadth.
Answer: B
Walking diagonally means covering the rectangle's diagonal, which forms a right triangle with the two sides.
\[ b = \sqrt{20^{2} - 16^{2}} = \sqrt{400 - 256} = \sqrt{144} = 12 \text{ m} \]
This is the 3–4–5 triple scaled by four: 12, 16, 20.
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