tolong jawabannya yang benar sama caranya itu yang merah hanya curat coret saja

13.
r = D ÷ 2 = 28 dm ÷ 2 = 14 dm
t = 28 dm
JSS = 28 dm + 42 dm = 70 dm

Luas Trapesium :
L = ½ × (JSS) × t
L = ½ × 70 × 28
L = 70 × 14
L = 980 dm²

Luas Lingkaran :
L = πr²
L = 22/7 × 14 × 14
L = 22 × 2 × 14
L = 44 × 14
L = 616 cm²

Luas yang Diarsir :
L = 980 dm² - 616 dm²
L = 364 dm²

Jawaban : b. 364 dm²

14.
D = 24 - 5 - 5 = 14 cm
r = D ÷ 2 = 14 cm ÷ 2 = 7 cm
Panjang = 30 cm
Lebar = 24 cm

Keliling Persegi Panjang :
K = p + p + l + 5 + 5
K = 30 + 30 + 24 + 10
K = 60 + 34
K = 94 cm

Keliling Lingkaran :
K = ½ × πr
K = ½ × 2 × 22/7 × 7
K = ½ × 22 × 2
K = ½ × 44
K = 22 cm

Keliling Seluruhnya :
K = 94 cm + 22 cm
K = 116 cm

Jawaban : c. 116 cm

15.
t = 15 cm
a = 20 cm
T = 30 cm

Volume Prisma Segitiga :
V = ½ × a × t × T
V = ½ × 20 × 15 × 30
V = 10 × 15 × 30
V = 150 × 30
V = 4.500 cm³

Jawaban : c. 4.500 cm³

16.
t = 12 cm
a = 14 cm
T = 40 cm

Volume Prisma Segitiga :
V = ½ × a × t × T
V = ½ × 14 × 12 × 40
V = 7 × 12 × 40
V = 84 × 40
V = 3.360 cm³

Jawaban : b. 3.360 cm³

17.
r = D ÷ 2 = 28 cm ÷ 2 = 14 cm
t = 15 cm

Volume Tabung :
V = πr²t
V = 22/7 × 14 × 14 × 15
V = 22 × 2 × 14 × 15
V = 44 × 14 × 15
V = 616 × 15
V = 9.240 cm³

Jawaban : a. 9.240 cm³

Maaf Kalau Salah