How do you find the angle using the cosine function?

To find the angle (θ) using the cosine function, use the inverse cosine function: $$θ = \text{cos}^{-1}igg(\frac{A}{H}igg)$$ .

How do you find the angle using the tangent function?

To find the angle (θ) using the tangent function, use the inverse tangent function: $$θ = \text{tan}^{-1}igg(\frac{O}{A}igg)$$ .

What is the value of sin(30°)?

The value of sin(30°) is $$\frac{1}{2}$$ .

What is the value of cos(60°)?

The value of cos(60°) is $$\frac{1}{2}$$ .

What is the value of tan(45°)?

The value of tan(45°) is $$1$$ .

What is the hypotenuse of a right triangle with legs of length 5 and 12?

Using the Pythagorean theorem: $$c = \text{sqrt}(5^2 + 12^2) = \text{sqrt}(25 + 144) = \text{sqrt}(169) = 13$$ .

What is the sine of a 90° angle?

The sine of a 90° angle is $$1$$ .

What is the cosine of a 0° angle?

The cosine of a 0° angle is $$1$$ .

Right Triangles and Trig Flashcards

Student preview

15 questions

Show all answers

1.

FLASHCARD QUESTION

Front

What is the Pythagorean theorem?

Back

Tags

CCSS.8.G.B.7

2.

FLASHCARD QUESTION

Front

What is the sine function in a right triangle?

Back

Tags

CCSS.HSG.SRT.C.6

3.

FLASHCARD QUESTION

Front

What is the cosine function in a right triangle?

Back

Tags

CCSS.HSG.SRT.C.6

4.

FLASHCARD QUESTION

Front

What is the tangent function in a right triangle?

Back

Tags

CCSS.HSG.SRT.C.6

5.

FLASHCARD QUESTION

Front

If a right triangle has legs of length 3 and 4, what is the length of the hypotenuse?

Back

Tags

CCSS.8.G.B.7

6.

FLASHCARD QUESTION

Front

What is the relationship between sine, cosine, and tangent?

Back

Tags

CCSS.HSG.SRT.C.6

7.

FLASHCARD QUESTION

Front

How do you find the angle using the sine function?

Back

Tags

CCSS.HSG.SRT.C.8

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