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31 March, 12:56

For which angle theta is cos theta = -1?

a) 270

b) 360

c) 450

d) 540

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Answers (2)
  1. 31 March, 12:57
    0
    Your answer would be D 540
  2. 31 March, 13:09
    0
    540°.

    Step-by-step explanation:

    On a unit circle, cos θ = - 1 at 180°.

    However, cos θ has a period of 2π, or 360°. This means that cos θ will equal to - 1 again after 2π.

    To solve for the angle:

    180° + 360° = 540°. This is the next angle at which cos θ = - 1.
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