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
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If the diameter of a circle is 40 m then the area (in terms of Pi) is: about 400pi m2
The quadrant is the one of the four quaters of a circle. It is the math term for a 1/4 of a circle.
The area of a circle = (1/4 x pi) times (the diameter)2
Well the formula for a full circle is 3.14xradius squared So cut the radius in half then square it the multiple by 3.14
Assuming the base is a circle with radius r, then V=πr2h.