A.
7. d = √p² + l² + t²
d = √8² + 6² + 24²
d = √64 + 36 + 576
d = √676
d = 26 cm (A)
8. Balok
p = 8 dm
l = 5 dm
t = 6 dm
V air = 160 liter = 160 dm³
V bak = 8 x 5 x 6
= 240 liter
Tinggi air
160 = 8 x 5 x t
160 = 40 t
t = 160 : 40
t = 4 dm ( C)
9. Bak
p = 80 cm = 8 dm
l = 60 cm = 6 dm
t = 80 cm = 8 dm
t air = 10 cm = 1 dm
t sisa = 8 - 1 = 7 dm
debit = 12 liter/ menit
waktu = ?
V bak = 8 x 6 x 7
V = 336 dm³ = 336 liter
debit = volume / waktu
waktu = Volume : debit
waktu = 336 : 12
waktu = 28 menit (D)
10. Kerangka balok
= 4p + 4l + 4t
= 4 x 11 + 4 x 12 + 4 x 13
= 44 + 48 + 52
= 114 cm
Panjang kawat = 2 meter = 200 cm
Sisa kawat = 200 - 144
= 56 cm
B.
1) V = luas alas x t
V = 396 x 12
V = 4.752 cm³
2) Balok
V = p x l x t
= 32 x 20 x 12
= 7.680 cm³
3) Balok
V = p x l x t
12.600 = 35 x l x 24
t = 12.600 : 840
t = 15 cm
4) V Kardus = 75 x 50 x 40
= 150.000 cm³
V kotak kue = 20 x 15 x 10
= 3000 cm³
Banyak kotak kue yang ditampung
= 150.000 : 3000
= 150 : 3
= 50 buah
5) V = 23 x 17 x 15
V = 5.865 cm³
Lp = 2 x ( pl x pt x lt)
Lp = 2 x (23 x 17 + 23 x 15 + 17 x 15)
Lp = 2 x (391 + 345 + 255)
Lp = 2 x 991
Lp = 1.982 cm²
6) p = 1,5 m = 15 dm
l = 1 m = 10 dm
t = 1,2 m = 12 dm
V = ⅘ liter
Sisanya..... liter
V = 15 x 10 x 12
V = 1800 liter
Sisanya agar penuh = 5/5 - ⅘ = ⅕
= ⅕ x 1800
= 360 liter
7) V = 2000 liter
Luas alas = 10 m² = 1000 liter
Bak dikuras ⅖
Ditanya t air = ?
V = luas alas x tinggi
2000 = 1000 x t
t = 2000 : 1000
t = 2 dm
Sisa air = 5/5 - ⅖ = ⅗
= ⅗ x 2 dm
= 6/5 = 1⅕ dm
Jadi kedalaman air nya adalah 1⅕ dm
8) Lp = 2 x ( pl + pt + lt)
Lp = 2 x ( 85 x 65 + 85 x 40 + 65 x 40)
Lp = 2 x ( 5525 + 3400 + 2600)
Lp = 2 x ( 11525)
Lp = 23.050 cm²
9) Lp = 2 x ( pl + pt + lt)
Lp = 2 x ( 1,4 x 0,5 + 1,4 x 0,75 + 0,5 x 0,75)
Lp = 2 x ( 0,7 + 1,05 + 0,375)
Lp = 2 x (2,125)
Lp = 4,25 cm²
Biayanya 4,25 x 22500 = 95.625
Semoga membantu dan tidak keliru
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