Question

A flying disc in the shape of a circle has a circumference of 8 inches. What is the radius of the flying disc.

Answer 1

A.

Explanation:

Recall that circumference is given by:

`C=2\pi r`

We know that the circumference is 8π inches. Thus, we can substitute 8π for C:

`8\pi =2\pi r`

To solve for r, the radius, we can divide both sides by 2π. Hence:

`\displaystyle r = (8\pi)/(2\pi)=4`

Therefore, the radius is four inches.

Our answer is A.