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There are 2 identical small circles, 1 medium circle and a large circle in the figure.
The diameter of the small circle is 7 cm.
The diameter of the large circle is 4 times that of the diameter of the small circle.
(a) What is the perimeter of the shaded region ?
(b) What is the area of the shaded region?
[ Take π to be `22/7` ]
Notes to students: