how to enter correct commands into calculator for cosine rule provlem

[blondebutlearning]

Hi guys i get the theory from highschool but im a ditzy gal. Cant really put it all together....can someone help me answer this so i have the method right for my test!

The pilot of a helicopter hovering 100m above the bank of a river observes the opposite bank to be at an angle of dwpreaaion of 57° how wide is the river?

Im not sure how to shape the triange...and know i need to apply cosine? Not real sure how to get to answer....

 

[Bob Brown MSEE]

hint

 

[soroban]

Hello, blondebutlearning!

The pilot of a helicopter hovering 100m above the bank of a river observes
the opposite bank to be at an angle of depression of 57°. .How wide is the river?

Careful! . . . Note where the angle of depression is located.

      * - - - -
      | *  57[SUP]o[/SUP]
      |   *
  100 |     *
      |       *
      |         *
      * - - - - - *
            w

 

[HallsofIvy]

Spam! Delete It!