Answer:
I think the perimeter is 8 yd
Step-by-step explanation:
Because it's a square, if one side is 2 yd then we can assume that the remaining 3 sides are also 2 yd long. So, 2 yd + 2 yd + 2 yd + 2 yd = 8 yd
Hope this helps :)
Was there supposed to be a picture attached?
Divide the nonagon radially into 9 congruent, equilateral isosceles triangle. Each triangle has vertex angle of 360°/9 = 40°.
Interior angle of polygon = 180°-40° = 140°.
Sum of interior angles = 9(140°) = 1260°
How to solve:

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Write all numerators above the least common denominator which is 24 in this case.

Subtract the numbers

Alternate form: 0.458333
The final, simplified, fraction answer is:
B should be the correct answer