Question

Jawab soalnya semua ya

Answer 1

10. 2πr = 2 × 22/7 × 14
= 2 × 22 × 14 dibagi 7
Karena 14 dibagi 7 = 2
Jadi, 2 × 22 × 2 = 88 cm (B)

11. K=2πr
Diketahui d = 40 cm, jadi r = 20 cm, π = 3,14

2πr
=2 × 3,14 × 20
= 125,6 cm (C)

12. 2πr = K Lingkaran
2 × 3,14 × r = 12,56
6,28 × r = 12,56
r = 12,56 : 6,28
r = 2

Luas Lingkaran
π × r × r
= 3,14 × 2 × 2
= 12,56 cm persegi (C)

13. Karena ada diameter, jadi
1/4 × π × d × d
= 1/4 × 22/7 × 28 × 28
28 dibagi 4 = 7
28 dibagi 7 = 4
= 22 × 7 × 4
= 616 (C)