Determinants

⭐ Important Questions

1. Find area of triangle with vertices (3,8), (-2,2), (5,1).
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   Area = 12|3(2-1) + (-2)(1-8) + 5(8-2)|\n= 12|3 + 14 + 30| = 47/2 = 23.5 sq units
2. Find det of [[1,2,3],[0,1,4],[5,6,0]].
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   det = 1(0-24) - 2(0-20) + 3(0-5)\n= -24 + 40 - 15 = 1