The picture below shows a portion of a river dam:
Which of the following can be used to calculate the height of the river dam?
115 divided by cos 50 degrees
115 cos 50°
115 tan 50°
115 divided by sin 50 degrees

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##### 1 Attachment

- kropot72

Do you know the definitions of the Trig functions for a Right Triangle?

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## More answers

- anonymous

No :(

- kropot72

You can find them here:
http://www.regentsprep.org/regents/math/algtrig/att1/trigsix.htm

- anonymous

NONO

- anonymous

I just need help working out the question.

- mathstudent55

|dw:1439169760946:dw|

- mathstudent55

Look in the triangle I drew above.
Now look at your problem
Which pieces of info do you know and what are you looking for?

- anonymous

The opposite is what I am looking for.

- mathstudent55

|dw:1439169845899:dw|

- mathstudent55

Correct.

- anonymous

dayyyum girl u smart

- anonymous

Okay so how do I find it?

- mathstudent55

|dw:1439169912884:dw|

- mathstudent55

You want the opposite. You have the angle and the adjacent.
Which trig function, sine, cosine, or tangent, relate the angle measure to the opposite and the adjacent?

- anonymous

Opposite is cosine

- anonymous

Adjacent is Sine

- mathstudent55

No.
Look in my drawing above.
First, the cosine does not have the opposite at all.
In addition, you need one ratio that has both adjacent and opposite since we don't know anything about the hypotenuse.

- anonymous

Oh im sorry it is tan because of opp/adj

- mathstudent55

|dw:1439170136519:dw|

- mathstudent55

Exaclty.

- mathstudent55

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- mathstudent55

Now you can rewrite the left side as a fraction over 1 and solve it like a proportion by cross multiplying.

- mathstudent55

|dw:1439170321855:dw|

- mathstudent55

Do you understand it?

- anonymous

Yes I think so. So that means it would be C?

- mathstudent55

Correct.

- anonymous

Thank you for helping me @mathstudent55

- mathstudent55

You're welcome.

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