15,7 cm
Penjelasan dengan langkah-langkah:
lingkaran besar = π x d x 1/2
= 3,14 x 20 x 1/2
= 31,4 cm
lingkaran kecil = 3,14 x 10 x1/2
= 15,7
keliling = 31,4-15,7 = 15,7 cm
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15,7 cm
Penjelasan dengan langkah-langkah:
lingkaran besar = π x d x 1/2
= 3,14 x 20 x 1/2
= 31,4 cm
lingkaran kecil = 3,14 x 10 x1/2
= 15,7
keliling = 31,4-15,7 = 15,7 cm