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Holding a big tree represents mathematics.
The shadow length of the high benchmark of 1m is 0.5m, which means that the shadow length is half of the benchmark.

So when the shadow of a tree on the ground is 3 meters, it means that the corresponding tree is 6 meters, plus 2 meters parallel to the wall. The height of this big tree is 6+2 = 8 meters.

Enumerable proportion:

Let the part of the tree cast on the ground be x meters.

X:3= 1:0.5