A. 197,76 B. 157 C. 98,88 D. 88,98 (Tolong dijawab ya)

Bab Lingkaran
Matematika SD Kelas VI

1/2 Lingkaran besar
d = 20 + 8
2r = 28
r = 28/2
r = 14 cm

Luas = 1/2 x π x r x r
         = 1/2 x (22/7) x 14 x 14
         = 308 cm²

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1/2 Lingkaran sedang
d = 20 cm
2r = 20 cm
r = 20/2
r = 10 cm

Luas = 1/2 x π x r x r
         = 1/2 x 3,14 x 10 x 10
         = 157 cm²

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1/2 Lingkaran kecil
d = 8 cm
2r = 8
r = 8/2
r = 4 cm

Luas = 1/2 x π x r x r
         = 1/2 x 3,14 x 4 x 4
         = 25,12 cm²

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Luas daerah yang diarsir = 308 - 157 - 25,12
                                         = 125,88 cm²