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altavistard
If you have an eye for geometry you can see that each shape has the dimensions x by 3x.

Thus, (3 blocks)(3x per block) comes out to 9x=16.2 cm = length of rectangle.
If this is true, then x = 1.8 cm


Then the area of the rect. is (width)(length) = (9 cm)(16.2 cm) = 145.8 cm^2.
Algebraically,                     5(1.8 cm)(16.2 cm)  =   145.8 cm^2   (answer)

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