How do you find the value of cos Pi?

The value of cos 180 degrees or the value of cos pi can be represented in terms of different angles like 0°, 90°and 270°.

To find the value of cos Pi

To find the value of cos Pi we need to know the values of cos 90°and 270°.


Cos 180°= cos(270° – 90°)

Cos 180°= – sin 90° (We know that cos ( 270° – a ) = – sin a)

The value of sin 90 degree is 1.

Substitute the value in the above relation, we get

Cos 180°= – (1) = -1

Therefore, the value of cos 180° is -1.

Cos 180°= -1

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