Here, take the long semi-axis 2 meters and the short semi-axis 1: 5 meters as examples to teach you how to draw an ellipse.

Draw an axis

Draw two axes perpendicular to each other and equally divided. Determine the positions of the major axis and minor axis of the ellipse to be drawn on the axis, that is, the four points A, B, C and D. ..

Determine the length of the rope

Tie two nails at both ends of a string to ensure that the center distance between the two nails is the length of the long axis of the drawn ellipse, that is, the length of AB = 4m.

Draw an arc

Draw an arc with either endpoint of the short semi-axis as the center and the long semi-axis as the radius. The arc intersects the long axis at two points. In this example, draw two points, e and f, with d as the center and OA = 2m as the radius.

Fixed rope

Fix the two nails of the finished rope with nails at both ends at the two intersections of the drawn arc and the long axis, that is, E and F.

Draw an ellipse

Put the drawing needle on the top of the folded string, and under the control of the string, the trajectory drawn by the drawing needle is the ellipse to be drawn.