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nahh CD itu bisa dibilang U +V
BC = c - b = v
CD = d - c
AD = d - a
sehingga :
-a = u - b
-b = v - c
-c = CD - d
AD = 2(BC)
d - a = 2v
d + u - b = 2v
d + u + v - c = 2v
d + u + v + CD - d = 2v
CD + u + v = 2v
CD = 2v - v - u
CD = v - u
→ E.