Calculating shaded area.
Let the equal lengths of the ascribed trapezoid be a.
Calculating a.
a² = 6²+(18-a)²
0 = 36+324-36a
36a = 360
a = 10 units.
Therefore, shaded area is;
½(10+18)*6-½(6*18)
= 84-54
= 30 square units.
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