Homework Help: trig

Posted by Barb on Wednesday, November 28, 2012 at 11:43pm.

angles of elevation to an airplane are measured from the top and the base of a building that is 40 m tall. The angle from the top of the building is 31°, and the angle from the base of the building is 40°. Find the altitude of the airplane. (Round your answer to two decimal places.)

trig - Steve, Thursday, November 29, 2012 at 5:28am
measured from the plane, the building subtends an angle of 9°

the distance d from the top of the building to the plane is found by

d/sin50° = 40/sin9°
d = 195.87

now, knowing d, the height h of the plane can be found:

(h-40)/d = sin31°
(h-40)/195.87 = sin31°
h = 40 + 195.87 sin31°
h = 140.88
h =

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