Calculating area of the square.
sina = 28/35
a = asin(28/35)°
b = a-45
b = (asin(28/35)-45)°
c²+28² = 35²
c² = 35²-28²
c = 21 units.
cos(asin(28/35)-45) = 21/d
d = 21.2132034356 units.
d is the diagonal of the square.
Let e be the side length of the square.
Therefore, square area, e² is;
2e² = 21.2132034356²
e² = ½(450)
e² = 225 square units.
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