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b.)luas=(11+3)4÷2
luas=14×2=28 cm²
alas segitiga = 11-3 / 2
= 4 cm
tinggi t = 4.tg 45
= 4 cm
b. L = 1/2. (AB+CD). t
= 1/2. (11+3).4
= 28 cm²