Question

a circle without circumference​

Answer 1

Answer:

The “perimeter” of a circle is also known as it circumference, and you cannot calculate it without the number pi. pi is the ratio of the circumference of a circle to its diameter. If the diameter is 1, then the circumference is equal to pi (you can approximate pi as 3.14; this is a common practice).

Answer 2

Answer:

it cannot happened. every surface has its borderline and circumference of the circle is the border