The radius of a circle is 4 miles. What is the circle's circumference?
r=4 mi
Use 3.14 for .

Answer:
25.13
C= 2πr = 2 · π · 4 ≈ 25.13274
Step-by-step explanation:
C= 2πr = 2 · π · 4 ≈ 25.13274