Respuesta :

Circumference is what we need to know. 
The formula is πd. 
Diameter is twice the radius. 
2 x 15 = 30 
30 x 3.14 = 94.2 
1/3 of the length means dividing it by 3. 
94.2 ÷ 3 = 31.4 
The answer is D. 
Hope this helps!
The answer is D hope i helped