"`ABCD` बिंदुओं `A(-1,\ -1),\ \ B(-1,\ 4),\ \ C(5,\ 4)` को मिलाकर बनने वाला एक आयत है

ABCD is rectangle formed by the points A(-1, -1), B(-1, 4), C(5, 4) and D(5, -1). If P, Q, R and S be the midpoint of AB, BC, CD and DA respectively, show that PQRS is a rhombus.

Points A(4, 5, 1), B (0, - 1, - 1), C (3 , 9, 4) and D( -4, 4, 4) are

Find the area of quadrilateral ABCD whose vertices are A(-3, -1), B(-2, -4), C(4, -1) and D(3, 4).

If the three vertices of a parallelogram ABCD are A(3, -1, 5), B(1, -2, -4) and C(0, 3, 0), then the coordinates of fourth vertex is

The area of the quadrilateral ABCD where A(0,4,1), B(2,3,-1), C(4,5,0) and D(2,6,2), is equal to

The three vertices of a parallelogram ABCD are A(-1,3,4), B(2,-1,3) and C(5,1,2). Find the co-ordinates of its 4th vertex D.

The vertices of quadrilateral ABCD are A(5,-1) B(8,3), C(4,0) and D(1,-4). Prove that ABCD is a rhombus.

The vertices of a reactangle ABCD are A (-1, 0) B (2,0), C (a,b) and D(-1, 4). Then the length of the diagonal AC is