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Mathematics 17 Online
OpenStudy (anonymous):

A lookout spots a fire from a 27 meters tower. The angle of depression from tower to fire is 14 degrees. To the nearest meter, how far is the fire from the base of the tower?

OpenStudy (anonymous):

I just need a drawing of this.

jimthompson5910 (jim_thompson5910):

Start with the tower |dw:1372022188631:dw|

jimthompson5910 (jim_thompson5910):

then add in the fire |dw:1372022233648:dw|

jimthompson5910 (jim_thompson5910):

We know that "The angle of depression from tower to fire is 14 degrees" so this means that if you start looking straight horizontal and look down 14 degrees, you'll be looking straight at the fire

OpenStudy (anonymous):

|dw:1372022253577:dw|

jimthompson5910 (jim_thompson5910):

so this means we can add this in |dw:1372022289122:dw|

OpenStudy (anonymous):

|dw:1372022349059:dw|

jimthompson5910 (jim_thompson5910):

because these two lines are parallel |dw:1372022323151:dw| we know that these two angles are congruent (they're alternate interior angles) |dw:1372022352714:dw|

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