Question

Is it a function or not a function?

Answer 1

No a circle is not a function.

Explanation:

A function is a mapping from 1 set to another

eg, 1 to 2

3 to 4

while a circle it maps the same point to another

meaning it has more than two input/output

(if u get what i mean)

Answer 2

Not a function

Explanation:

Fails the vertical line test