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In reality, the shape of rainbow is a circle. The center of the circle is an imaginary line between the center of the sun and the head of the viewer.
A circle has a round shape in which every point on the circle is the same distance from one point called "the center". The center of a circle is not on the circle.
true - Distributions that have the same shape on both sides of the center are called symmetric
That shape is called a circle.
If the shape is two-dimensional then it is a circle, if the shape is three-dimensional then it's a sphere.