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Verified answer
4.AB = 14
CD = 7
DE = 2/5 AE >> DE : AE = 2 : 5
EF = 2x - 3
DE / DA = EF / AB
2n / (2n + 5n) = (2x - 3) / 14
2 / 7 = (2x - 3) / 14
14 × 2 = 7 × (2x - 3)
28 = 14x - 21
28 + 21 = 14x
49 = 14x
49 : 14 = x
3,5 = x
5.
Titik persilangan = O
segitiga ABO = segitiga CDO
AB / CD = AO / CO
12 / 24 = AO / CO
1 / 2 = AO / CO
AO : CO = 1 : 2
AF = CF
= (AO + CO) : 2
= (1 + 2) : 2
= 1,5
FO = AF - AO
= 1,5 - 1
= 0,5
AB / EF = AO / FO
12 / EF = 1 / 0,5
12 × 0,5 = EF
6 cm = EF