Answer:
Option B
Step-by-step explanation:
a=side of square=8.4
h = height of the triangle = [tex]1/2(8.4) sin 60 = 2.1\sqrt{3}[/tex]
Each triangle on 4 sides would be equilateral because one angle is 60 and isosceles.
Side of triangle s = 8.4
base area = [tex]a^2 = 70.56\\[/tex]
Area of each equilateral triangle = [tex]\sqrt{3} \frac{s^2}{4} =17.64\sqrt{3}[/tex]
Hence surface area = base area +4(area of each triangle)
[tex]= 70.56+17.64\sqrt{3}(4)\\=192.769\\=192.8[/tex] square yards
Hence option B is right answer
