They have a circumference which is 2*pi*radius or diameter*pi
They have an area which is pi*radius2
They have sectors
They have chords
They have segments
They have a total of 360 degrees around their circumferences
They have arcs which is part of their circumferences
They can have a tangent which is a straight line that touches it at one point
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To calculate properties of circles
A sphere, a cylinder and a cone all have properties of a circle in them
It can be any # it wants to.
The circular base of a cylinder has the same properties as that of a circle.
Little plastic circles that help understand how to do the 4 problems in math and teach students about the properties of negative numbers.