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The line segment with endpoints (−20, 21) and (0, 0) is graphed on the standard coordinate plane and makes an angle, Θ, with respect to the x axis. What is cos Θ?

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Answer:

-20/29

Step-by-step explanation:

Using the Pythagorean Theorem, (20)2 + (21)2 = c2; c = 29. Since cosine is the adjacent side, cosΘ = −20/29


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