Notice!
AC = 7+7
AC = 14 units.
It implies;
14² = 2a²
a² = ½(196)
a = √(98)
a = 7√(2) units.
a is the side length of square ABCD.
Therefore, shaded area yellow is;
Area square with side length 7√(2) units - 2(area quarter circle with radius 7 units).
= (7√(2)*7√(2))-2(¼*7*7π)
For π = (22/7)
= 98-½(22*7)
= 98-77
= 21 square units.
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