What is the cosine function used for in right triangles?
Unit 5 Review!

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Mathematics
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9th - 12th Grade
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Hard
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1.
FLASHCARD QUESTION
Front
Back
The cosine function relates the angle to the ratio of the length of the adjacent side to the hypotenuse.
2.
FLASHCARD QUESTION
Front
How do you set up the cosine function to find a missing side in a right triangle?
Back
cos(θ) = adjacent/hypotenuse.
3.
FLASHCARD QUESTION
Front
What is the value of cos(37) if the adjacent side is 14 and the hypotenuse is x?
Back
cos(37) = 14/x.
4.
FLASHCARD QUESTION
Front
What is the relationship between sine, cosine, and tangent in a right triangle?
Back
sin(θ) = opposite/hypotenuse, cos(θ) = adjacent/hypotenuse, tan(θ) = opposite/adjacent.
5.
FLASHCARD QUESTION
Front
What is the secant function?
Back
The secant function is the reciprocal of the cosine function: sec(θ) = 1/cos(θ).
6.
FLASHCARD QUESTION
Front
What is the value of sec(3π/2)?
Back
undefined.
7.
FLASHCARD QUESTION
Front
What does it mean for a trigonometric function to be undefined?
Back
A trigonometric function is undefined when its denominator is zero.
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