What is the approximate circumference of a circle that has a diameter of 20? Use 3.14 for π and express your answer to the tenths place.
The circumference of a circle is given by the formula C = πd, where d is the diameter. Substituting d = 20 and π = 3.14, we get:
C = 3.14 × 20 = 62.8
Rounding to the tenths place, the approximate circumference is 62.8 units.