Answer:
D A = (1/2) (y₂ - y₁)(x₃ - x₁)
Explanation:
b = (y₂ - y₁)
h = (x₃ - x₁)
A = (1/2)bh
A = (1/2) (y₂ - y₁)(x₃ - x₁)
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