The points (-a, -b), (0, 0), (a, b) and (`a^2`,ab) are (a)Collinear (b) vertices of a reotangle (c) Vertices of an parallelogram (d) None of these

The points (-a, -b), (0, 0), (a, b) and (a^2, ab) are (a)  Collinear      (b)  Vertices of a rectangle (c)  Vertices of an parallelogram     (d)   None of these.

The points A(1,1,0),B(0,1,1),C(1,0,1) and D(2/3,2/3,2/3) are (A) coplanar (B) nonn coplanar (C) vertices of a parallelograsm (D) none of these

The points A(1,1,0),B(0,1,1),C(1,0,1) and D(2/3,2/3,2/3) are (A) coplanar (B) non coplanar (C) vertices of a parallelogram (D) none of these

The points (-a ,-b),(a , b),(a^2,a b) are (a) vertices of an equilateral triangle (b) vertices of a right angled triangle (c) vertices of an isosceles triangle (d) collinear

The points (-a ,-b),(a , b),(a^2,a b) are (a) vertices of an equilateral triangle (b) vertices of a right angled triangle (c) vertices of an isosceles triangle (d) collinear

The points (-a ,-b),(a , b),(a^2,a b) are (a) vertices of an equilateral triangle (b) vertices of a right angled triangle (c) vertices of an isosceles triangle (d) collinear

The points A(1,1,0),B(0,1,1),C(1,0,1) and D(2/3, 2/3, 2/3) are (A) coplanar (B) non coplanar (C) vertices of a paralleloram (D) none of these

The points A(1,1,0),B(0,1,1),C(1,0,1) and D(2/3, 2/3, 2/3) are (A) coplanar (B) non coplanar (C) vertices of a paralleloram (D) none of these

The points (-a,-b),(a,b),(a^(2),ab) are (a) vertices of an equilateral triangle (b) vertices of a right angled triangle (c) vertices of an isosceles triangle (d) collinear

Show that the points A(2, 1), B(0,3), C(-2, 1) and D(0, -1) are the vertices of a square.