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 one half of an inch? Express your answer as a decimal.
As you clearly stated, the formula for the circumference of a circle is multiplying its diameter by pi, or in this case 3.14. As the diameter here is 0.5 inch, the circumference must be 3.14(0.5). So, the circumference must be 1.57 inches.
