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Verified answer
Bab SegitigaMatematika SMP Kelas VIII
pada ΔABE
BE = √(AB² - AE²)
= √(20² - 12²)
= √(400 - 144)
= √256
= 16 cm
BC = BE - EC
= 16 - 6
= 10 cm
karena sebangun, maka
BC/AB = CD/AE
10 / 20 = CD/12
CD = 12 x 10/20
CD = 6 cm
jawabannya C