For the unlabeled angle above, the angle 90-x:

So the question wanted sin/cos(90-x) not sin/cos x

the alternative answers offered would suggest this is a correct assumption.

I am not surprised that you also have found this confusing. In the past I have often been confused by the worksheets on the course zee-f is doing.

Sometimes it has taken us longer to sort out what the question means than get the answer.

Have a look at post 90 on

http://www.mathisfunforum.com/viewtopic … =15902&p=2

Bob

]]>If the diagram in post 2 is the correct one to use then:

the longest side is the hypotenuse and that is 5

the adjacent is next to the x and that is 3

the side opposite the x is 4

so sin x is O/H = 4/5 = 0.8

and cos x = A/H = 3/5 = 0.6

If you are being asked for sin( 90 -x) then the adjacent and opposite for that angle are the other way round so

sin(90-x) = 0.6

cos(90-x) = 0.8

Bob

]]>But I would like to know why 4 is the adjacent and **not** the opposite, same goes for 3 but visa versa...

I only used the image for this, as I don't currently see another way of doing this at the moment.

7. I took the number 4 (the opposite) and divided it by the number 5 (the hypotenuse), and got 0.8, thus that SHOULD be the sine, but if you see, there is no answer for that, the closest one would be C 0.9...

8. I took the number 3 (the adjacent) and divided it by the number 5 (the hypotenuse), and got 0.6, which should be the cos. If that is correct, it would be C 0.6

Now, because 7. does not equal the correct answer, I would personally wait for someone else to either verify or correct this. I'm sorry ahead of time is this is not correct.

]]>7. b

8. a]]>

I know how to find the sine, cosine, and tangent but this problem is confusing any clues ? I just what to know how to get the adjacent, hypotenuse,and opposite.

Still looking at the image above, one angle is angle x, and another is the right angle (90o). Since the angles in a triangle add up to 180o, the other angle will be 90-x. For the unlabeled angle above, the angle 90-x:

7. What is the sin?

A 0.3

B 0.6

C 0.9

D0.4

E 0.2

F 0.5

8. What is the cos?

A 0.8

B0.2

C0.6

D0.4

E 0.1

F 0.9