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Trigonometry & Applications Flashcards

7 cards from real Geometry practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Trigonometry & Applications flashcards as text

  1. Convert 180° to radians.

    Answer: π

    180° equals π radians by definition.

  2. What is the reference angle for 210°?

    Answer: 30°

    210° is in the third quadrant; its reference angle is 210° − 180° = 30°.

  3. In which quadrant is sine positive but cosine negative?

    Answer: Second

    In quadrant II, sine is positive and cosine is negative.

  4. What is cos 120°?

    Answer: −1/2

    120° has reference angle 60° in quadrant II, so cos 120° = −cos 60° = −1/2.

  5. Convert π/3 radians to degrees.

    Answer: 60°

    π/3 × 180°/π = 60°.

  6. The point on the unit circle at angle 90° has coordinates:

    Answer: (0, 1)

    At 90° the unit-circle point is (cos 90°, sin 90°) = (0, 1).

  7. What is sin 270°?

    Answer: −1

    At 270° the unit-circle y-coordinate is −1, so sin 270° = −1.