The Unit Circle Answers

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

y = ?

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 IIIII✔ IV(none of the quadrants).

The angles that share the same sine value as sin(45°) have terminal sides in quadrant ✔ IIIIIIV(none of the quadrants).

The angles that share the same tangent value as tan(45°) have terminal sides in quadrant II✔ IIIIV(none of the quadrants).

Identify the reference angle [image 1] for each given angle, [image 2] . [image 3] degrees.

When theta = 225 degrees, phi = degrees.

When theta = 480 degrees, phi = degrees.

When theta = negative 210 degrees, phi = degrees.

Select all angle measures for which sine theta = negative StartFraction StartRoot 2 EndRoot Over 2 EndFraction

Select all angle measures for which cosine theta = one-half

Select all that have a value of 0.

270°360°450°540°

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