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area of shaded part = area of (square WXYZ – triangle ABX – triangle AWZ – triangle BYZ) = (18 x 18) – (1/2) x 11 x (18/2) – (1/2) x 18 x (18/2) – (1/2) x 18 x (18 – 11) = 324 – 49.5 – 81 – 63 = 130.5

Ans : 130.5 sq cm.

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This is a Area question.

BYZ = 1/2 × 18 × 7 = 63

AXB = 1/2 × 9 × 11 =49.5

AWZ = 1/2 × 18 × 9 = 81

18 × 18 – 63 – 49.5 – 81 

= 130.5 cm2

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