How do you know what formula to use when solving an geometry angle question. For example:...

How do you know what formula to use when solving an geometry angle question. For example: Jessica sits on top of a 150ft tower. Suddenly she sees a boat from where she sits. If the angle of depression of the boat is 6 degrees, how far is the boat from the base of the tower?

sin 6 degrees= .10
cos 6 degrees =.99
tan 6 degrees =.11

the book used tan 6 degrees to solve, looking for the adjacent side as variable "x".

Why couldn't we use COS? but my other real question is again how would you know which formula to use regarding questions like this and questions not like this.

Expert Solution

milcah answered 2 years ago

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