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BQ = a , QC = a --> BC = 2a
.
DP :PC = 2 : 1
DP= 2a , PC = a --> DC = 3a
.
QD + DC = QC
QD = QC - DC = a - 3a = -2a
T tengah QD --> QT = TD = - 1/2 (QD)= - a
.
AT + TD = AD --> AT = AD- TD--> AT = 2a +a= 3a
TD +DP = TP
-a + 2a = a
AT : TP = 3a : a = 3 : 1