It is the diameter
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It's called the radius and to find the area of a circle you do radius squared, then times pi.
A circle with a straight line through it, usually at an angle, and often with a small dot where the centre of the circle would be (also on the line, to clarify that the line does go through the centre).
a line has a dot on each end and a ray only has one dot and an arrow, it keeps on going.
Open dot at 4 and a line going to the left on the number line.
You draw the dot first!~