Krishna
0

Step 1: Draw a special right triangle with a 60° angle.

NOTE: A special right triangle 30\degree-60\degree-90\degree.

It's sides are 1, 2 and \sqrt{3}

Step 2: Recall the definition of cosine and calculate \cos\ 60\degree

DEFINITION: The cosine (cos) of an angle in a right triangle is a ratio.

It is the length of the adjacentleg (adj) divided by the length of

the hypotenuse (hyp).

NOTE:  The length of the adjacent  side is  1

length of the hypotenuse is 2

and

Step 3: Calculate \cos\ 30\degree

The length of the adjacent side is   \sqrt{3}

length of the hypotenuse is 2