The ratio of the circumference of a circle to its diameter is A
always \piπ:1.

B
equal to the area of the circle.

C
dependent on the length of the radius.

D
different depending on the size of the circle.

always piπ:1. "A"

Step-by-step explanation:

circumference of a circle= 2πr

diameter of a circle=2r

ratio of circumference to radius=2πr/2r

=π/1 or π:1

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

the answer is d

hope this