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36)uang kakak = k
uang adik = a
a : k = 1 : 4
selisih = Rp 36.000,00
jumlah = (1+4)/(4-1) × 36.000
jumlah = 5/3 × 36.000
jumlah = Rp 60.000,00
Jadi jumlah uang kakak dan uang adik adalah Rp 60.000,00 (C)
37)
jawabannya (D)
38)
BC = 35 cm
AB = 21
(AC)^2 = (BC)^2 - (AB)^2
(AC)^2 = 35^2 - 21^2
(AC)^2 = 1225 - 441
(AC)^2 = 784
AC = V784
AC = 28 cm
Jadi panjang AC adalah 28 cm (B)
39)
DE = (2x + 2)
DF = 2x
EF = 3x + 1
L = 24 cm^2
L = 1/2 × DF × DE
24 = 1/2 × (2x) × (2x + 2)
24 = x × (2x + 2)
24 = 2x^2 + 2x
2x^2 + 2x - 24 = 0
(2x - 6)(x + 4) = 0
2x - 6 = 0 atau x + 4 = 0
2x = 6 atau x = -4 (tidak memenuhi)
x = 6/2
x = 3
EF = 3x + 1
EF = 3(3) + 1
EF = 9 + 1
EF = 10 cm
Jadi panjang EF adalah 10 cm (A)
40)
AB = 25 cm
AD = 12 cm
CD = 20 cm
(BC)^2 = (AD)^2 + (AB - CD)^2
(BC)^2 = 12^2 + (25 - 20)^2
(BC)^2 = 144 + 5^2
(BC)^2 = 144 + 25
(BC)^2 = 169
BC = V169
BC = 13 cm
K = AB + BC + CD + AD
K = 25 + 13 + 20 + 12
K = 70 cm
Jadi keliling bangun ABCD adalah 70 cm (D)