Current location - Training Enrollment Network - Mathematics courses - Nantong middle school mathematics
Nantong middle school mathematics
Solution: Make CD⊥AB in D.

Let AD=x, then BD = 50× 20-x =1000-x. 。

∫∠EAC = 60,

∴∠CAB=90 -60 =30。

In Rt△BCD,

∫∠FBC = 45,

∴∠CBD=∠BCD=45,

∴CD=DB= 1000-x.

In Rt△ACD,

∫∠CAB = 30,

∴CD=tan30? AD,

That is db = CD = tan 30? AD= 1000-x=33x,

Solution: x≈633.98,

∴CD= 1000-633.98=366.02.

A: The distance from Building C to AB Expressway is 366.02 meters.