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If the length of one of the 6 identical rectangle is u cm , the  width of  one of the 6 identical rectanglecs is  ( 4.4 – u) cm from the diagram.

Again, from the diagram,

 6.6 = u + 3( 4.4 – u)

6.6 = 13.2 -2u

2u = 6.6

u = 3.3

width = 4.4 – 3.3 = 1.1

Shaded area of the rectangles = 6.6 * 4.4 – 6 * 3.3 * 1.1

= 29.04 – 21.78

= 7.26 cm²

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