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Sagot :
Step-by-step explanation:
Perimeter of a semicircle = 0.5πd.
Perimeter of big semicircle = (0.5)(π)(18cm) = 9πcm
Perimeter of 3 small semicircles = (1.5)(π)(6cm) = 9πcm
Hence total perimeter = 9πcm + 9πcm = 18πcm.
Area of a semicircle = 0.5πr²
Area of big semicircle = (0.5)(π)(9cm)² = 40.5πcm²
Area of 3 small semicircles = (1.5)(π)(3cm)² = 13.5πcm².
Hence total area = 40.5πcm² + 13.5πcm² = 54πcm².
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