The Unit Circle

Question 1

Find the coordinates of the point (x, y) shown on the unit circle. x = ?

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-1/2

Question 2

y = ?

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Answer image: https://media.edgenuity.com/EVresources/3111-13-04-20-01-task/mc001-3.jpg

Question 3

Consider all angles whose reference angle is 45° with terminal sides not in Quadrant I.The angles that share the same cosine value as cos 45° have terminal sides in quadrant .

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IV

Question 4

The angles that share the same sine value as sin(45°) have terminal sides in quadrant .

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II

Question 5

The angles that share the same tangent value as tan(45°) have terminal sides in quadrant .

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III

Question 6

Identify the reference angle for each given angle, . degrees. degrees. degrees. degrees.

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Part 1: 60; Part 2: 45; Part 3: 60; Part 4: 30

Question 7

Select all angle measures for which

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Answer image: https://media.edgenuity.com/EVresources/3111-13-04-20-04-task/mr001-3.jpg; Answer image: https://media.edgenuity.com/EVresources/3111-13-04-20-04-task/mr001-4.jpg; Answer image: https://media.edgenuity.com/EVresources/3111-13-04-20-04-task/mr001-6.jpg

Question 8

Select all that have a value of 0.

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Answer image: https://media.edgenuity.com/EVresources/3111-13-04-20-06-task/mr001-1.jpg; sin 0; Answer image: https://media.edgenuity.com/EVresources/3111-13-04-20-06-task/mr001-3.jpg

Question 9

270°360°450°540°

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540°

Question 10

Explain how to find the exact value of sin(570°).

Revolt · Accepted Answer

Find that the terminal side lands in quadrant III. The angle is coterminal with a 210° angle. The reference angle is 30°. The sine of 30° is 1/2. Sine is negative in quadrant III. The sine of 570° is –1/2.

The Unit Circle Answers

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