# Cosine value

$\Delta GHI$ is a right angled triangle.

It is measured that

• Length of the opposite side $\stackrel{‾}{GI}$ is meters
• Length of the adjacent side $\stackrel{‾}{HI}$ is meters
• Length of the hypotenuse is $\stackrel{‾}{HG}$ is meters
• The angle of the triangle is .

Now, calculate value of the cosine at angle ${30}^{°}$ by considering the length of the adjacent side and length of the hypotenuse.

The value of cosine at the angle ${30}^{°}$ is $0.866$ for the triangle $GHI$.

$\Delta FED$ is another right angled triangle and it is measured that,

• The length of the opposite side $\stackrel{‾}{DF}$ is meters
• The length of the adjacent side $\stackrel{‾}{EF}$ is meters
• The length of the hypotenuse is $\stackrel{‾}{ED}$ is meters
• The angle of the triangle is .

Repeat same procedure to calculate the value of cosine at an angle ${30}^{°}$ for the right angled triangle $FED$.

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