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What is the value of cos(180°)?

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Question: What is the value of cos(180°)?

Options:

  1. 0
  2. -1
  3. 1
  4. Undefined

Correct Answer: -1

Solution: 

cos(180°) = -1.

What is the value of cos(180°)?

Practice Questions

Q1
What is the value of cos(180°)?
  1. 0
  2. -1
  3. 1
  4. Undefined

Questions & Step-by-Step Solutions

What is the value of cos(180°)?
  • Step 1: Understand that cos(θ) is the cosine function, which is a trigonometric function.
  • Step 2: Know that the angle 180° is located on the negative x-axis in the unit circle.
  • Step 3: Recall that on the unit circle, the coordinates of the point at 180° are (-1, 0).
  • Step 4: The cosine of an angle is equal to the x-coordinate of the corresponding point on the unit circle.
  • Step 5: Since the x-coordinate at 180° is -1, we conclude that cos(180°) = -1.
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