All exterior angles of a regular polygon would equal 360 degrees. SO... based on that, one exterior angle would have to multiplied by whatever sum (whole number) to equal 360 degrees to find the number of sides. Here you divide 360 by one of the exterior angles, if it does not equal a whole number then it would be inaccurate.
In this case only 54 degrees would not fit into one of the exterior angles.
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❖ The length of the field is 91 m.
Divide to find the missing length:
4641 ÷ 51 = 91
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The value of cos E is
. The correct option is A. 
<h3>Trigonometry </h3>
From the question, we are to determine the value of cos E
From the given information, we have

By SOH CAH TOA
Opposite = 24
Hypotenuse = 25
Thus, considering the diagram
/EF/ = 24
and
/DE/ = 25
By SOH CAH TOA

∴ 
Hence, the value of cos E is
. The correct option is A. 
Learn more on Trigonometry here: brainly.com/question/14337584
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