What is the exact value of cos 30° ?
enter your answer, as a simplified fraction, in the box.

=  .

Step-by-step explanation:

Given  :  cos 30°

To find  : What is the exact value of cos 30°  as a simplified fraction, in the box.

Solution : We have given that  cos 30°

By the trigonometric cos 30°  =  .

cos 30°  =  .

Therefore, =  .

step-by-step explanation:

circumference divided by 3.141592654 then timesthe radius twice

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.