Question

the radius of a circular disc is 5.8 inches.find the circumference .use 3.14 for n
A) 18.121 in
B) 36.424 in
C) 42.34 in
D) 54.63 in

Answer 1

I think it is A. Although you might have mixed up the numbers because I got 18.212

Work:

5.8 x 3.14

Answer 2

It is B.
The formula for the circumference of the circle is Pi x diameter. Since you only have the radius, you must times the radius by two to get the whole diameter. The diameter is 11.6. Now 11.6 times Pi equals 36.424