86 = 9 x 9 + 5
Area of triangle
Numerical: Find area of triangle with vertices( 1, 0),( 6, 0),( 4, 3) Solution:
Area = ½( 1( 0x1 – 3 x 1) + 0 + 1( 6 x 3- 4 x 0)) Or Area = 15 / 2
Minors
Minor of an element aij of a determinant is the determinant obtained by deleting its i th row and j th column in which element aij lies. Minor of an element
aij is denoted by Mij.
Minor of an element of a determinant of order n( n ≥ 2) is a determinant of order n – 1.