Plane and Spherical Trigonometry

 Kells, Kern and Bland, McGraw-Hill, 1940.

If the angle A is 33.69^o how tall is the lighthouse?

The point O is 8.5' above the water. The angle of elevation to B is 28.5^o and the angle of depression to C is 20.4^o .Can you find the height BC of the sailboat?

If the ships are one mile apart can you find the height h of the mountain?

What is the height of the tower? Note that the surveyor is 5' tall. 

Nice figure! If the telephone pole extents 5' above where the top of the triangle intersects it, how tall is the pole?

The first illustration of the book. What were world events like in 1940? The cadet is 6' tall and his shadow is 3' long. If the shadow of the flagpole is 7' long how tall is the flagpole?

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