Answer
Square based figures were designed for the Warhammer (Old World) game, easier to form rows and columns of troops. Round bases for 40K, units don't move or fight the same way.
You might see square bases in a 40K game on some of the (lesser) daemons as the models are the same between games.
In a circle what is the difference between a central angle and an arc?Read more: In_a_circle_what_is_the_difference_between_a_central_angle_and_an_arc
Opposite hemispheres.
A circle is complete and a cycle repeat
they are circle figures
A circle has a constant radius whereas an oval does not.
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The radius of a circle is 1/2 of the diameter.
A line is straight and never-ending. A circle curves and is round.
Diameter is the distance across a circle. The circumference of a circle is the distance around the outside of the circle.
circles have no sides or angles
the circle has equidistance and it has no angle and sides while the polygon has sides and angle
a circle is a curved shape with no angels and a rhombus is a polygon with four angles