Calculating x.
a = 9+3
a = 12 units.
Therefore the ascribed plane shape (quadrilateral or irregular quadrilateral) is an equilateral triangle of side length 12 units with a subtraction of a smaller equilateral triangle of side length 3 units.
It implies;
a² = x²+6²
12² = x²+6²
x² = 144-36
x = √(108)
x = 6√(3) units.
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