An open circle is usually found on a number line in math. An open circle usually represents a number that is not included in the line.
it means it is close
If you are talking about a graph, a solid circle means that point, say (3,4), is included, and an open circle it is not included
The quadrant is the one of the four quaters of a circle. It is the math term for a 1/4 of a circle.
we use open circle
The area of a circle is pi times r squared.
Basically, the circumference of a circle is the perimeter of the circle.
The point in the middle of a circle is called the center.
In a circle
The length of the edge of a circle.