If sin A = 1/2, what are the possible values of A in the range [0°, 360°]?

Practice Questions

Q1
If sin A = 1/2, what are the possible values of A in the range [0°, 360°]?
  1. 30°, 150°
  2. 45°, 135°
  3. 60°, 300°
  4. 90°, 270°

Questions & Step-by-Step Solutions

If sin A = 1/2, what are the possible values of A in the range [0°, 360°]?
  • Step 1: Understand that sin A = 1/2 means we are looking for angles A where the sine value is 1/2.
  • Step 2: Recall the unit circle and the values of sine for common angles.
  • Step 3: Identify that sin 30° = 1/2. This gives us one possible angle: A = 30°.
  • Step 4: Recognize that sine is positive in the first and second quadrants.
  • Step 5: In the second quadrant, the angle that has the same sine value as 30° is 180° - 30° = 150°.
  • Step 6: List the possible angles: A = 30° and A = 150°.
  • Trigonometric Functions – Understanding the sine function and its values in different quadrants.
  • Unit Circle – Using the unit circle to determine angles corresponding to specific sine values.
  • Angle Range – Identifying angles within a specified range, particularly in degrees.
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