Question

The radius of a circle is 9. Using π, which equation expresses the ratio of the circumference of the circle to the circle's diameter? A) C /9 = π B) C /18 = π C) C = 9π/r D) C = r /18π

Answer 1

c/18=pie because this needs atleast 20 characters.hope this helps. and have a good day every one

Answer 2

Option B is correct

`(C)/(18) = \pi`

Explanation:

Circumference of the circle(C) is given by:

`C =\pi D`

where,

D is the diameter of the circle.

As per the statement:

The radius of a circle is 9

We know that:

`\text{Diameter} =  2 \cdot \text{radius}`

then;

`\text{Diameter} = 2 \cdot 9 = 18`

We have to find the ratio of the circumference of the circle to the circle's diameter:

`C =\pi D`

Substitute the given value we have;

`C=18 \pi`

⇒
`(C)/(18) = \pi`

Therefore, the ratio of the circumference of the circle to the circle's diameter is,

`(C)/(18) = \pi`