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If cos 60° = 1/2, which of the following angle has cosine of -1/2?

Mathematics
WAEC 1988

If cos 60° = 1/2, which of the following angle has cosine of -1/2?

  • A. 30o
  • B. 120o
  • C. 150o
  • D. 210o
  • E. 300o
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Correct Answer: Option B
Explanation

cos 60° = 1/2, cos(180° - 60°) = -1/2

cos120° = -1/2

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Join your school's WhatsApp group
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789