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AD^2 = 15^2 - 12^2
AD^2 = 225 - 144
AD = √81
AD = 9 cm
DB = 9-2
DB = 7 cm
AB = AD+DB
AB = 9+7
AB = 16 cm
L DBC
= L ABC - LCAD
= 1/2×AB×AC - 1/2×AD×AC
= 1/2×16×12 - 1/2×9×12
= 96 - 54
= 42 cm2
Jawaban: B