What is the exact circumference of a circle with a diameter of 17 inches?

Possible answers:
17p inches
34p inches
8.5p inches
72.25p inches
289p inches

I keep getting 53.4..what am I doing wrong?

Question

What is the exact circumference of a circle with a diameter of 17 inches?

Possible answers:
  17p inches
       34p inches  
       8.5p inches
       72.25p inches
       289p inches

I keep getting 53.4..what am I doing wrong?

diyadiya · Answer

$$Circumference = 2 \times \pi \times radius$$$$=2 \times \pi \times \frac{17}{2}$$$$=17 \pi\  inches$$

anonymous · Answer

I got that using a calculator but disregarded it for whatever reason..meh. Thanks a lot.

diyadiya · Answer

Haha 
You're Welcome :)