Jawaban harus tulis di buku​

14). Sisi lengkung besar (½ lingkaran):

d = 14 cm

K = ½ × π × d = ½ × 22/7 × 14

= ½ × 22 × 2 = 22 cm

Sisi lengkung kecil ((2) ½ lingkaran = 1 lingkaran):

d = 14/2 = 7 cm

K = π × d = 22/7 × 7 = 22 cm

Total: 22 + 22 = 44 cm

15). Luas seluruhnya (½ lingkaran):

d = 14 cm, r = 14/2 = 7 cm

L = ½ × π × r² = ½ × 22/7 × 7 × 7

= ½ × 22 × 7 = 11 × 7 = 77 cm²

Luas tidak diarsir ((2) ½ lingkaran = 1 lingkaran):

r = 14/4 = 7/2 cm

L = π × r² = 22/7 × 7/2 × 7/2

= 22 × ½ × 7/2 = 11 × 7/2

= 77/2 = 38,5 cm

Luas diarsir: 77 – 38,5 = 38,5 cm²