Question

If (1, a), (2, b) and (c, –3) are vertices of a triangle, then its centroid will lie on x-axis if

• A. a + b + 3 = 0
• B. a + b = 0
• C. a + b = 3
• D. c + 3 = 0

Answer 1

Answer: (C)

a + b = 3

Answer 2

Centroid ŗ $\left( \frac{1 + 2 + c}{3},\frac{a + b - 3}{3} \right)$

it will lie on x-axis if y- coordinate is zero;

\ a + b = 3