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keliling lingkaran besar:
(22 ÷ 7 × 21 ÷2) + ( 22 ÷ 7 × 14 ÷ 2)
= (33) + (22) = 55
keliling linkaran kecil:
(22 ÷ 7 × 14 ÷ 2) + (22 ÷ 7 × 7 ÷ 2)
= 22 + 11
= 33
total keliling:
55 + 33 = 88 cm