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Yes, if you use both sides of the mathematical cone (on each side of the apex).
yes
Yes
Tangent circles are circles that touch one another without crossing. The distance between the centres of the circles must be equal to the difference or the sum of their radii.
circles dont have sides
degrees!
4.
The 360 equal sections are called degrees.
Yes. Congruent circles by definition have the same size, and the radius sufficiently describes the size of a circle.
cylinder
2
Yes, that is correct. Circles circumscribed about a given triangle will have centers that are equal to the incenter, which is the point where the angle bisectors of the triangle intersect. However, the radii of these circles can vary depending on the triangle's size and shape.