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BD = 1/2BC
(BC kuadrat) - ((1/2BC) kuadrat) = (CD kuadrat)
(BC kuadrat) - ((1/2BC) kuadrat) = 10 akar 3 kuadrat
(BC kuadrat) - ((1/2BC) kuadrat) = 300
misal 400 - 100 = 300
maka BC =20
KELL = 60