Final answer:
To find the circumference of a circle with a diameter of 40 cm, multiply the diameter by pi (π) which is approximately 3.14.Therefore, the circumference of the circle is approximately 125.6 cm.
Step-by-step explanation:
To find the circumference of a circle with a diameter of 40 cm, we can use the formula C = πd, where C is the circumference and d is the diameter.
In this case, the diameter is 40 cm, so we can substitute this value into the formula:
C = π(40) = 40π
Using the approximation π ≈ 3.14, we can calculate:
C ≈ 40 × 3.14 = 125.6 cm
Therefore, the circumference of the circle is approximately 125.6 cm.