An observer

An observer standing west of the tower sees its top at an altitude angle of 45 degrees. After moving 50 meters to the south, he sees its top at an altitude angle of 30 degrees. How tall is the tower?

Correct answer:

y =  35.3553 m

Step-by-step explanation:

A=45 B=30 x3=50 m  tanA=y:x1 tanB=y:x2  x22=x32+x12=502+35.35532=2500  y=x1 tanA=x2 tanB=35.3553 m  x1 tanA=x2 tanB x12 tan2 A=x22 tan2 B  x12 tan2 A=(x32+x12) tan2 B  t1=(tanA)2=(tan45 )2=12=1 t2=(tanB)2=(tan30 )2=0.577352=0.33333  x12 t1=x32 t2+x12 t2 x12 (t1t2)=x32 t2  x1=x3 t2t1t2=50 0.333310.3333=25 2 m35.3553 m  y=x1 t1=35.3553 1=25 235.3553   Verifying Solution:  x2=y/t2=35.3553/0.3333=25 6 m61.2372 m  x22=x32+x12=502+35.35532=25 6 m61.2372 m



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