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= (18+18) + (22/7).14
= 36 + 44
= 80 cm
2. keliling = 2 sisi sejajar + keliling lingkaran
= (19+19) + (3,14).12
= 38 + 37,68
= 75,68 cm
3. keliling = (1/2)keliling lingkar besar + keliling lingkaran kecil
= (1/2).(22/7).28 + (22/7).(14)
= 88 cm
4. keliling = 35 + 12 + 16 + 21 + (1/2) keliling
= 84 + (1/2)(22/7)(14)
= 84 + 22
= 106 cm