Question

The diameter of a circle measures 28 mm. What is the circumference of the circle?

Use 3.14 for y, and do not round your answer. Be sure to include the correct unit in your answer.

Answer 1

C = 87.92 mm

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

Geometry

Circumference Formula: C = πd

• C is circumference
• d is diameter

Explanation:

Step 1: Define

Diameter d = 28 mm

Step 2: Solve

1. Substitute in variables [Circumference Formula]: C = 3.14(28 mm)
2. [Circumference] Multiply: C = 87.92 mm