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Hexagon. Although circles would represent a more accurate omnidirectional coverage, when we want to group circles together, they overlap one another. Hexagon doesn't and still has a somewhat 'circular' shape.
A rectangle and two circles.
circles
A cylinder.
No. Congruent means the same shape and the same size. Two perfect circles would be the same shape but they might not be the same size.
It means that all of the sides in the shape are the same shape and the same size and they slot together when you place the shapes together. * * * * * No, they do not slot together - as a lock and key would. Each one could exactly cover the other.
Hexagon. Although circles would represent a more accurate omnidirectional coverage, when we want to group circles together, they overlap one another. Hexagon doesn't and still has a somewhat 'circular' shape.
A rectangle and two circles.
As the foci of an ellipse move closer together, the ellipse becomes more circular in shape. When the foci coincide, the shape is a circle. Note that circles are a subset of ellipses.
There is no shape which has only circular faces.
Circles are the easiest shape to make.
circles
circles
Circles have a completely curved shape, and NO sides. So do ovals.
a cylinder has two faces that are circles
rectangles and circles
2 circles