find the area of triangle whose are (1,-1),(-4,6)and(-3,5).
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Area of triangle = 1/2 × [1(6 + 5) – 4(–5 + 1) – 3(–1 – 6)]
= 1/2 × [11 + 16 + 21]
= 48/2
= 24 sq. units.
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