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I can't tell what the oval abc stands for, so I have to draw a solution.
What does abc of the ellipse stand for? The graphic answer is as follows:

1, a of the ellipse represents the distance of the major axis, b represents the distance of the minor axis, and c represents the focal length.

2. Related content: An ellipse refers to the locus where the sum of the distances from a moving point P to a fixed point F 1 and F2 on the shis plane is equal to a constant (greater than |F 1F2|), and F 1 and F2 are called the two focuses of the ellipse. The mathematical table is | pf1|| pf2 | = 2a (2a > | f1F2 |). An ellipse is a conic curve, that is, the tangent of a cone to a plane. The circumference of an ellipse is equal to the length of a specific sine curve in a period. Now there are many mathematical problems involving ellipses.

3. English expression: ellipse

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