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shaded area = 17.38 cm²

Step-by-step explanation:

given:

diameter of circle = 18 cm and = side of square

π = 3.142

shaded area = ( Area of square - Area of circle ) x 1 / 4

Area of square = s² = 18² = 324 ²cm

Area of circle = π d² / 4

                       = 3.142 (18²) / 4

                       = 254.5 cm²

therefore, shaded area = ( 324 cm² - 254.5 cm² ) * 1/4

                                       = 17.38 cm²

final answer is : )