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Can a first-grade ball be rounded?
The first-grade ball can't draw a circle.

According to the understanding of the first grade, the ball can't draw a circle, because the ball is three-dimensional and the circle is flat.

You can use the projection method to create a new datum plane first, and draw a circle on the datum plane opposite to the center of the sphere. Then project this circle onto the sphere, and the projection line is a circle.