Respuesta :

Space

Answer:

C ≈ 12.56 mi

General Formulas and Concepts:

Pre-Alg

  • Order of Operations: BPEMDAS

Geometry

  • Diameter: d = 2r
  • Circumference: C = 2πr

Step-by-step explanation:

Step 1: Define

d = 4

Step 2: Find Circumference

  1. Rewrite formula:                    C = πd
  2. Substitute:                              C = 4π
  3. Evaluate:                                C ≈ 12.56