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# Homework Help: dgh

Posted by pooi on Saturday, December 17, 2011 at 3:03pm.

Two Trees are 150 m apart. From a point halfway between them, the angle of

elevation of their tops is 15°and..? 15°, and 20°.
a)How much taller is one tree than the other?
b) Where would a person have to stand in order to have the angle of elevation to the top of each tree the same?
• dgh aka trig - Steve, Saturday, December 17, 2011 at 6:02pm

I can't believe you drew a diagram and can't see how to solve this.

Anyway, looking at the diagram, let the small tree's height be h, and the tall tree's height be H.

h/75 = tan 15°
h = 20.096

H/75 = tan 20°
H = 27.297

So, at what distance x from the smaller tree do they both have the same angle of elevation? At that point the tangent of both angles will be the same:

20.096/x = 27.297/(150-x)
x = 63.6

So, standing 63.6m from the shorter tree, the tops of both trees will have the same angle of elevation, 17.54°

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