You can put this solution on YOUR website! What is the length of the longest pole that can be put in a room (25 meters * 12 meters * 8 meters)?
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Let 8 meters be the height.
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Diagonal of the base = sqrt[25^2+12^2] = sqrt[769]
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Diagonal of the box: sqrt[8^2 + (sqrt(769))^2] = sqrt[64+769] = 28.86.. meters
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Cheers,
Stan H.