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=22/7×21
=66 cm
4. Klingkaran = π×d
=3,14×100
=314 cm
K = 2πr
K = 2 x ²²/₇ x 10,5
K = 66 cm
2) jawab
K = 2πr
K = 2 x 3,14 x 50
K = 314 cm