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avatar+315 

Trig

 Apr 24, 2019
 #1
avatar+106535 
+2

From his line of sight....we have that

 

tan (20)  =  height of street lamp from his line of sight / distance from streetlamp

 

tan (20)  =  height of streetlamp from his line of sight  /  25    ..... multiply both sides by 25

 

25* tan (20)  =  height of streetlamp from his line of sight

 

So......the total height of the streetlamp  = 

 

6 + 25 * tan(20) ≈  15 ft

 

 

cool cool cool

 Apr 24, 2019
edited by CPhill  Apr 24, 2019
 #2
avatar+315 
+1

Thank you! smiley

Cupcake  Apr 24, 2019

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