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4u ——- 288
1u ——- 288/4 = 72
11u ——- 11 x 72 = 792 (area of unshaded part of square)

(shaded part + 792)/(shaded part + 288) = 9/5
5 x shaded part + 3960 ——- 9 x shaded part + 2592
9 – 5 = 4 x shaded part ——- 3960 – 2592 = 1368
1 x shaded part ——- 1368/4 = 342
342 + 792 + 288 = 1422

Ans : 1422 sq cm.

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