A circle has a radius of 10 centimeters. Using pi as approximately 3.14, what is its circumference?

1. The formula for circumference is 2 times pi times the radius. 2. Substitute 3.14 for pi and 10 for the radius: 2 x 3.14 x 10. 3. Multiply 2 x 3.14 first, which gives 6.28. 4. Multiply 6.28 by 10, which gives 62.8. 5. So the circumference is approximately 62.8 centimeters. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 5 "Decimals", section 5.3 Decimals and Fractions_