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There is such a math problem in ancient mathematics in China: a dead tree stands upright on the ground. ...
It can be said to be the topic of a right triangle.

The height of the tree and the horizontal length of the rope are right angles. ...

The length of the rope is the hypotenuse ... Pythagorean theorem ...

The rope has been idle for seven weeks ... the horizontal length is 7*3=2 1 foot. ...

The height of this tree is 2 feet =20 feet.

20 2+212 = 29 2 ```````````` 20 2129 ``` is the Pythagorean number.

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