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(a) Radius of the bottom half circle = 42 cm and radius of top half circle = 60 cm

If Radius of the bottom quarter circle is u cm,

42*2 + 2u = 60*2 + u

u = 36

36 + 60*2  = 156

Length of JG =156 cm.

(b) Perimeter of the shaded part

= half perimieter of the circle with radius 60cm + radius of bottom small quarter circle + 1/4 of perimeter of the bottom quarter circle

= 3.14 * 60 + 36 + 2*3.14 * 36/4 cm = 188.4 + 36 + 56.52 cm = 280.92 cm

Note: Sorry for providing the wrong answer, had corrected , Tks BzBBee for the correct answer!

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