Luas daerah diarsir
= Luas lingkaran besar - Luas lingkaran kecil
= π (rbesar^2 - rkecil^2)
= 22/7 ( 21 cm x 21 cm - 14 cm x 14 cm)
= 22/7 (441 cm^2 - 196 cm^2)
= 22/7 x 245 cm^2
= 770 cm^2 (B)
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Luas daerah diarsir
= Luas lingkaran besar - Luas lingkaran kecil
= π (rbesar^2 - rkecil^2)
= 22/7 ( 21 cm x 21 cm - 14 cm x 14 cm)
= 22/7 (441 cm^2 - 196 cm^2)
= 22/7 x 245 cm^2
= 770 cm^2 (B)