Luas segitiga yang terbentuk dari titik-titik (2,1) (2,4) (6,4) adalah.....satuan.
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a = (2,4) dan (6,4) = 4
t = (2,1) dan (2,4) = 3
jawab:
1/2 x a x t = 1/2 x 4 x 3 = 12/2 = 6