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lingkaran ( d = 28 Cm r = 14)
lingkaran ( d = 14 Cm r = 7)

luas setengah lingkaran
(r = 14) = 1/2 × 22/7 × 14²
= 11/7 × 14 × 14
= 308 cm²

luas lingkaran
(r = 7) = 22/7 × 7²
= 11/7 × 49
= 77 Cm²

luas daerah yg diarsir
= luas setengah lingkaran - luas lingkaran
= 308 cm² - 77 cm²
= 231 cm²