Jawaban:

1. Jari jari = 6 cm, keliling = 37,68 cm

2. diameter = 18 cm, keliling = 56,52 cm

3. Diameter = 30 cm, Jari jari = 15 cm

4. jari jari = 14 cm, Keliling = 88 cm

5. Diameter = 21 cm, keliling = 66 cm

6. Diameter = 14 cm, jari jari = 7 cm

Penjelasan dengan langkah-langkah:

1. jari jari = ½ × diameter = ½ × 12 = 6 cm

keliling lingkaran = 2 × π × r

= 2 × 3,14 × 6 = 37,8 cm

2. diameter = 2 × Jari jari = 2 × 9 = 18 cm

Keliling = 2 × 3, 14 × 9 = 56, 52 cm

3. Diameter = keliling / π = 94,2 ÷ 3, 14 = 30 cm

r, Jari jari = 30 × ½ = 15 cm

4. jari jari = 28 × ½ = 14 cm

Keliling = 2 × 22/7 × 14 = 88 cm

5. Diameter = 2 × 10,5 = 21 cm

Keliling = 2 × 22/7 × 10,5 = 66 cm

6. jari jari = Keliling / π = 154 ÷ 22 = 7 cm

diameter = 2 × 7 = 14 cm

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Mapel : Matematika

Kelas : 6 SD

Materi : Lingkaran

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