According to the meaning of the question ∠ c = 90,

∫∠A = 45，

∴AC=BC=xm，

∫AD = 142.6m，

∴CD=x- 142.6m，

In Rt△BDC,

∫∠BDC = 60，

∴tan60 =BCDC=3，

Namely xx? 142.6=3,

∴x=337.2m，

A: The height CB of this tower is about 337.2 meters.