Ellipse Construction via Concentric Circle Method:

Known the major axis AB and the minor axis CD. Using the center of the ellipse point O like center describe circles having the major and minor axes as diameters. Divide the circles into equal central angles and draw diametrical lines such as P₁P₂. From point P1 on the circumference of the larger circle,

Draw a line parallel to CD, the minor axis, and from point P′₁, at that the diameter P₁P₂ intersects the inner circle, draw a line parallel to AB, the major axis. The point of intersection of such lines, point E, is on the desired ellipse. At point P₂ and P′₂, repeat the similar procedure and locate point F. Hence, two points are established though line P1 P₂. Situate at least five points in each of the four quadrants. The ellipse is completed via drawing a smooth curve along with the points. This is one of the much more accurate methods.