Coloured region is;
Area triangle with height 6√(2) units and base 4.5sin45 units + Area triangle with height 3 units and base 5.65685424949sin45 units + Area triangle with height 1.5 units and base 2.82842712475sin45 units
= ½*6√(2)*4.5sin45 + ½*3*5.65685424949sin45 + ½*1.5*2.82842712475sin45
= 13.5 + 6 + 1.5
= 21 square units.
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