12. You are driving into St. Louis, Missouri, and in the distance you see the famous Gateway to the West arch. This monument rises to a height of 192 m. You estimate your line of sight with the top of the arch to be 2.0° above the horizontal. Approximately how far (in kilometers) are you from the base of the arch?

 

Figure above is not to scale as it would look like almost a single line as base is much larger than height.

We want adjacent side, we know opposite and angle, so Tan function is appropriate.

 

 

 

 

 

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This page last updated on January 11, 2020