What is a round figure that has no edges, it can be a clock, it can be the shape of the earth and all of the planets. It can also be the shape of a pizza.
What is the shape?
(A: A circle)
A circle is all points in the same plane that lie at an equal distance from a centre point. The circle is only composed of the points on the border. You could think of a circle as a hula hoop. It's only the points on the border that are the circle. The points within the hula hoop are not part of the circle and are called interior points.
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