If the points A(1,2),B(2,3)C(a,2) and D(4,3) form a parallelogram, find the value of a and height of the parallelogram taking AB as base.
If the points A(1,-2) , B(2,3) , C(-3,2) and D(-4,-3) are the vertices of a parallelogram ABCD, then taking AB as the base, find the height of the parallelogram.