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a.) kll. lingkaran = 2 × 3,14 ×10 ×10 = 2 × 314 = 628
b.) kll. lingkaran = π × d = 3,14 × 40 = 125,6
: 3,14 x 20
: 62,8cm
kell: π x d
: 3,14 x 40
: 125,6cm