[" The points "A(2,9,12),B(1,8,8),C(-2,11,8),D(-1,12,12)" form "],[" 1) A parallelogram "quad " 2) "A" rhombus "," 3) "Delta" camoro "]

The point A(2,9,12), B(1,8,8),C(-2,11,8) and D(-1,12,12) form

The points A(1,2),B(2,4) and C(4,8) form a/an

Show that the points A(1,2),B(4,3),C(1,0) and D(-2,-1) are the vertices of a parallelogram.

Show that the points A(1,2),B(4,3),C(1,0) and D(-2,-1) are the vertices of a parallelogram.

STATEMENT-1 The points A(2, 9, 12), B(1, 8, 8), C(-2, 11, 8) and D(-1, 12, 12) are the vertices of rhombus. and STATEMENT-2 : AB = BC = CD = DA and AC ne BD then the quadrilateral ABCD is called a rhombus.

Prove that the points A(-2,-1) B(1,0), C(4,3) and D(1,2) are the vertices of a parallelogram. Is it a rectangle ?

Show that A(-4,-7), B(-1,2), C(8,5) and D(5,-4) are the vertices of a parallelogram.

Show that A (-4,-7) , B (-1,2) ,C (8,5) and D (5,-4) are the vertices of a parallelogram.

By method, show that the quadrilateral with vertices A(1,2,-1), B(8,-3,-4), C(5,-1,1),D(-2,1,4) is a parallelogram.