tolong ya kak No 13-18 sama caranya

13.
Luas ½ Lingkaran :
L = ½πr²
L = ½ × 22/7 × 7 × 7
L = ½ × 22 × 7
L = ½ × 154
L = 77 cm²

Luas Segitiga :
L = ½ × a × t
L = ½ × (7 × 2) × 16
L = 14 × 8
L = 112 cm²

Luas Gabungan :
L = 77 cm² + 112 cm²
L = 189 cm²

Jawaban : c. 189

14.
Diameter Tabung :
V = ¼πd²t
19.250 = ¼ × 22/7 × 20d²
19.250 = 22/7 × 5d²
19.250 = 110/7d²
19.250 ÷ 110/7 = d²
d² = 1.225
d = 35 cm

Jawaban : d. 35

15.
Volume Kubus :
V = r³
V = 6³
V = 216 cm³

Volume Prisma :
V = 2 × 216 cm³
V = 432 cm³

Luas Alas Prisma :
V = La × t
432 = 18La
La = 432 ÷ 18
La = 24 cm²

Jawaban : a. 24

16.
Diagonal 2 :
L = ½ × d1 × d2
144 = ½ × 24d2
144 = 12d2
d2 = 144 ÷ 12
d2 = 12 cm

Jawaban : c. 12

17.
Luas Persegi :
L = s²
L = (14 × 2)²
L = 28²
L = 784 cm²

Luas 2 ¼ Lingkaran :
L = 2 × ¼πr²
L = ½ × 22/7 × 14 × 14
L = 22 × 2 × 7
L = 44 × 7
L = 308 cm²

Luas Daerah yang Diarsir :
L = 784 cm² - 308 cm²
L = 476 cm²

Jawaban : c. 476

18.
Luas Alas :
V = La × t
16.875 = 45La
La = 16.875 ÷ 45
La = 375 cm²

Jawaban : a. 375

Maaf Kalau Salah