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AD = √(64 + 36)
AD = √100
AD = 10 m
Luas ABC = Luas ABD + Luas ADC
= Luas ABD + (3/2 x Luas ABD)
= (1/2 x AB x BD) + (1/2 x 3/2 x AB x BD)
= (1/2 x 8 x 6) + (1/2 x 3/2 x 8 x 6)
= 24 + 36
= 60 m²
Luas ABC = 1/2 x AB x BC
60 = 1/2 x 8 x BC
BC = 60 x 2 / 8
BC = 120 / 8
BC = 15 m
DC = BC - BD