Question

prove that the points (1,2), (-2,1), and (-3,-2) are collinear​

Answer 1

Answer:

it is not a collinear

Step-by-step explanation:

let A(1,2), B(-2,1), C(-3,-2)

Area of triangle ABC = 1/2(X1(y2-y3)+X2(y3-y1)+X3(y1-y2)

X1= 1 ,y1= 2

X2=-2 ,y2=1

X3=-3 ,y3=-2

So,

1/2(1(1-(-2)+(-2)(-2-2)+(-3)(2-1)

1/2(1(1+2)-2(2+2)-3(2-1)

1/2(1×3-2×4-3×1)

1/2(3-8-3)

1/2×-8

=-4 So ,it is not a collinear