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A. Luas Lingkaran =
=
=
=
= 154 Cm²
B. Luas Lingkaran =
= 3,14 × (18÷2)²
= 3,14 × 9²
= 3,14 × 81
= 254,34 Cm²
C. Luas Lingkaran =
=
=
=
= 616 Cm²
D. Luas Lingkaran =
= 3,14 × (30÷2)²
= 3,14 × 15²
= 3,14 × 225
= 706,5 Cm²