Question

To the nearest tenth of a centimeter, what is the circumference of a circle with a radius of 2.5 cm? (Use 3.14 for π.) a. 25.1 cm c. 15.7 cm b. 38.7 cm d. 12.9 cm

Answer 1

The circumfrence of a circle is $\pi d$
diamter is 2r ( Two times the radius ) 
So you would now have
$5 \pi$
\pi = 3.14
so 
(3.14)(5) = 15.7 
The answer is B, 15.7 
In you question you wrote it as C