How to find the value of cos120 degree?

Answer: The value of cos 120 is equal to -1/2

The value of cos 120 degrees or the value of cos pi can be represented in terms of different angles like 0°, 90°and 180°.

Cos Values

cos 0° = √(4/4) = 1

cos 30° = √(3/4) = √3/2

cos 45° = √(2/4) = 1/√2

cos 60° = √(1/4) = 1/2

cos 90° = √(0/4) = 0

Cosine Pi Value Derivation

Cos 120°= cos(180° – 60°)

Cos 120°= – Cos 60°

Cos 120°= -1/2

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