Measure the length BC and CE of the benchmark, and get the length AB according to △CDE∽△CAB;

(2) The flagpole and Xiaoming are perpendicular to the ground.

∴△ABE∽△CDE，

∴CDAB=DEBE，

That is, 1.6AB=2.32.3+5.7,

The solution is ab =12823 ≈ 5.6m. 。

A: The height of the flagpole is about 5.6 meters.