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Luas = π × r × r
Luas = 22/7 × 21 cm × 21 cm
Luas = 1386 cm²
Keliling = π × d
Keliling = 22/7 × 42 cm
Keliling = 132 cm
k= 22/7 × 42 = 132 cm
L= 22/7×21×21= 1386 cm²