Question

The circumference, or perimeter, of a circle can be found by multiplying its diameter by 3.14. What is the circumference of a circle that has a diameter of 1/2 inch? Express your answer as a decimal.

Answer 1

Answer: 1.571 inches

Explanation:

The formula for a circumference of a circle is C = 2πr, where r is the radius of the circle. The radius is half of the diameter. We know that the diameter is 1/2 of an inch, so the radius is 1/4 of an inch.

So, plug 1/4 for r to get C = 2π(1/4) or approximately 1.571 inches.