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luas persegi panjang = 48x42= 2.016cm
luas 1/2 lingkaran = (1/2)x(22/7)x21x21=693cm.

luas = 2.016-693=1.323 (C)

L= L1 - L2 = 48x42 - 1/2 [tex] \pi [/tex] [tex] r^{2} [/tex]
L= 2016 - 1/2 22/7 x 21 x 21
L= 2016 - 693= 1.323 cm2 (c)

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