1. a: tembereng, b: tali busur

2. c: juring, d: busur

3. e: jari-jari, f: jari-jari (atau diameter?? soalnya garisnya yang panjang melewati titik pusat)

4. g: apotema, h: titik pusat

↓ L = π × r², K = π × d atau π × r × 2 ↓

5. L = 3,14 × 2 × 2 = 12,56 m²

6. K = 22/7 × 21 × 2 = 22 × 3 × 2 = 132 cm

7. r = 56 ÷ 2 = 28 cm

L = 22/7 × 28 × 28 = 22 × 4 × 28 = 2.464 cm²

K = 22/7 × 56 = 22 × 8 = 176 cm

8. 440 = 22/7 × r × 2

r = 440 ÷ 22/7 ÷ 2

r = 440 × 7/22 ÷ 2

r = 220 × 7/22

r = 10 × 7

r = 70 cm

9. Persegi

L = 14 × 14 = 196 cm²

Setengah lingkaran

r = 14 ÷ 2 = 7 cm

L = ½ × 22/7 × 7 × 7

= ½ × 22 × 7

= 11 × 7 = 77 cm²

Luas yang diarsir = 196 - 77 = 119 cm²

↓ Sudut pusat = 2 × sudut keliling ↓

↓ Sudut keliling = ½ × besar sudut pusat ↓

10. 70 × ½ = 35°

11. 45 × 2 = 90°

12. 90/360 × keliling lingkaran

= 90/360 × π × r × 2

= 90/360 × 22/7 × 7 × 2

= ¼ × 22 × 2

= ¼ × 44 = 11 cm

13. 90/360 × luas lingkaran

= 90/360 × π × r²

= 90/360 × 22/7 × 7 × 7

= ¼ × 22 × 7

= ¼ × 154 = 38,5 cm²

14. Luas juring = 38,5

Luas segitiga

= ½ × a × t

= ½ × 7 × 7

= 24,5 cm²

Luas tembereng = 38,5 - 24,5 = 14 cm²

15. d² = p² - (r1 + r2)²

d² = 13² - (7 + 5)²

d² = 13² - 12²

d² = 169 - 144

d² = 25

d = √25

d = 5 cm

< Mohon dikoreksi kalau ada yang salah!! >