Penjelasan dengan langkah-langkah:
7. A
PQR = 90° – 58° = 32°
8. C
ACD = (180° – 40°)/2 = 70°
9. D
MON = (360° – 120°)/2 = 120°
10. A
< A = 5 x 180°/(5+4)
< A = 5 x 180/9
< A = 5 x 20 = 100°
11. B
K = π x d
K = 22/7 x 21
K = 462/7
K = 66 cm
12. C
K = 22/7 x 14/2 + 3,14 x 10/2 + 2 x 4
K = 22 + 15,7 + 8
K = 30 + 15,7
K = 45,7 cm
13. C
r1 : r2 = 2 : 3
L1 : L2 = 2² : 3²
L1 : L2 = 4 : 9
14. A
Luas diarsir = 20 x 30 – 3,14 x 10²
= 600 – 314 = 286 cm²
15. D
Lj Besar OAB = (360° · 72°)/360° x 22/7 x 35²
= 4/5 x 22/7 x 35 x 35
= 88 x 35 x 35/35
= 3.080 cm²
16. A
PQ = 108° x 24/48°
PQ = 108°/2
PQ = 54°
17. C
AB minor = 135°/360° x 22/7 x 2 x 56
= ⅜ x 44 x 56/7
= 3 x 44 x 56/(8x7)
= 132 x 56/56
= 132 x 1
= 132 cm
18. B
Lj COD = 15 x 72/18
Lj COD = 15 x 4
Lj COD = 60 cm²
19. D
j = 18 + 8 = 26 cm
r1 – r2 = 18 – 8 = 10 cm
pgsL = √(j² – (r1–r2)²)
pgsL = √(26² – 10²)
pgsL = √(676 – 100)
pgsL = √576
pgsL = 24 cm
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