00:00:05 Summary of exercise 4.3

00:02:54 NCERT Solutions Exercise 4.3 Question 3

Find values of k if area of triangle is 4 sq. units and vertices are (i) (k, 0), (4, 0), (0, 2) (ii) (–2, 0), (0, 4), (0, k)

00:08:14 NCERT Solutions Exercise 4.3 Question 5

If area of triangle is 35 sq units with vertices (2, – 6), (5, 4) and (k, 4). Then k is (A) 12 (B) –2 (C) –12, –2 (D) 12, –2

00:10:34 NCERT Solutions Exercise 4.3 Question 4

(i) Find equation of line joining (1, 2) and (3, 6) using determinants. (ii) Find equation of line joining (3, 1) and (9, 3) using determinants. Finding minors and cofactors of 2x2 and 3x3 determinants

00:23:04 NCERT Solutions Exercise 4.4 Question 1

00:28:34 NCERT Solutions Exercise 4.4 Question 2

Finding determinant using cofactors of any row or column

00:36:54 NCERT Solutions Exercise 4.4 Question 3

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