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What is a circle?
A circle is the set of all the points that are the same (arbitrary) distance (called the radius) from some (arbitrary) point (called the center).
Are three points always contained in exactly one plane?
Three points determine exactly one plane.That means that if you bring me a plane, then some or all of my three points may ormay not lie in your plane. But if you bring me three points, then I can always draw aplane in which all of your points lie, and I can also guarantee that it's the only one.By the way ... three points also determine exactly one circle.
Can a triangle have a negative side?
The sides of a triangle are its lengths are cannot be negative. However, you could place a triangle on coordinate system and some points where the vertices are could be negative numbers.
What are some objects for the polygon with 12 sides called dodecagon?
All polygons
What is collinear rays?
They are rays that lie on the same line. For example draw a horizontal line. Now put 3 points anywhere on that line. Next draw 3 rays, some going to the left, some going to the right. These rays are collinear.
