Respuesta :

Space

Answer:

r = 20 km

General Formulas and Concepts:

Symbols

  • π (pi) ≈ 3.14

Pre-Algebra

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right  

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtraction Property of Equality

Geometry

Circumference of a Circle Formula: C = 2πr

  • r is radius

Step-by-step explanation:

Step 1: Define

Identify variables

C = 125.6 km

Step 2: Solve for r

  1. Substitute in variables [Circumference of a Circle Formula]:                        125.6 km = 2(3.14)r
  2. Multiply:                                                                                                             125.6 km = 6.28r
  3. [Division Property of Equality] Divide 6.28 on both sides:                            20 km = r
  4. Rewrite:                                                                                                             r = 20 km

Answer:

197.29

Step-by-step explanation:

Multiple the circumfernece by 3.14 and then divide that number by 2.

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