Question

A tree casts a shadow that is 150 feet long. If the angle of elevation from the tip of the shadow to the top of the tree is 30°, how tall is the tree to the nearest foot?

Answer 1

86.6 ft ≈ 87 ft. You can solve this using by multiplying tan 30° by 150. 

Answer 2

For this we use AAS
so first angle 30 degrees 
then second angle 90 degrees
and the length side of let's call it b = 150

By using Law of Sines 
we find that angle a (the tree) is 259.808 ft tall
(you can round to the nearest foot)

Hope this helps ;)