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t = 12 cm
a = 16 + 5 = 21 cm
L = x a x t = x 21 x 12 = 126
Perhatikan segitiga CDA
t = 12 cm
a = 5 cm
L = x a x t = x 5 x 12 = 30
Luas segitiga CAB = Luas segitiga CDB - Luas segitiga CDA = 126 - 30 = 96 ... (d)