Question

The circumference of a circle is 15 in. The diameter of the circle is _____ in.

4.78
6.28
9.88
11.86

Answer 1

circumference is given by
\[\Large C=2 pi r\]

Answer 2

first find r
then
Diameter =2r

Answer 3

....or just use \[C = \pi d \cdots \cdots\]

Answer 4

11.86

Answer 5

try again
pi =3.14

Answer 6

really? i expected something less... o.O