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area of triangle=1/2×base × height
=1/2×(2a-b)×(a/2-b)
=1/2×(a²-2ab-ab/2+b²)
=a²/2-2ab-ab/4+b²/2
=1/2×(2a-b)×(a/2-b)
=1/2×(a²-2ab-ab/2+b²)
=a²/2-2ab-ab/4+b²/2
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