That diagram can be split into a right angled triangle of base 7 and of height 4 + 5.2 + 2 = 11.2, and a square of length of 5.2 So the are of the total shape is the area of the right angled triangle + the area of the square.
=[tex] \frac{11.2*7}{2} +5.2^2=66.24[/tex]
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