How do you find the value of cos(pi/3) ?

1 Answer
Alan P.
Sep 19, 2016

cos(pi/3)=color(green)(1/2)

Explanation:

Consider an equilateral triangle with sides of length 2
Since the interior angles are all equal and have a sum of pi radians,
each angle is pi/3

Dividing the triangle into halves as in the image below
and remembering the definition of cos as ("adjacent side")/("hypotenuse")

We see that cos(pi/3)=1/2
enter image source here

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