What is the exact value of cosθ? https://media.glynlyon.com/g_alg02_ccss_2013/11/img_alg2u10al02_01.gif

A. sqrt 2/4
B. sqrt 2/2
C. sqrt 2
D. 1

Question

What is the exact value of cosθ? https://media.glynlyon.com/g_alg02_ccss_2013/11/img_alg2u10al02_01.gif

A. sqrt 2/4
B. sqrt 2/2
C. sqrt 2
D. 1

anonymous · Answer

What angle is shown on the drawing in degrees?

anonymous · Answer

(16, 16)

anonymous · Answer

That's the points..But What is the angle?

anonymous · Answer

|dw:1401223453265:dw|

anonymous · Answer

I don't know how to find it out

anonymous · Answer

What is the angle of this?|dw:1401223733652:dw|

anonymous · Answer

90 degrees

anonymous · Answer

Correct. Now looking at your drawing it appears that the line bisects the angle in half. So what would be the angle on our first drawing?

anonymous · Answer

30?

anonymous · Answer

1/2 of 90?

anonymous · Answer

Oh wait no. 45

anonymous · Answer

Great. Now are you familiar with the unit circle in trigonometry?

anonymous · Answer

No, that's what I'm confused about. They've explained it in a way I don't understand

anonymous · Answer

Do you have a book that shows you the unit circle?

anonymous · Answer

Yeah, I see a picture of it

anonymous · Answer

At 45 degrees does it show a value for cos?

anonymous · Answer

Oh it says 45 degrees means sqrt 2/2. Is that the answer then?

anonymous · Answer

Good job...

anonymous · Answer

Oh wow, it was so simple I looked over it. Thanks