If the diameter of a circle is 156, what is the circumference of the circle?

To find the circumference of a circle when the diameter is known, you can use the formula:

\[
C = \pi \times d
\]

where:
- \( C \) is the circumference,
- \( \pi \) is approximately 3.14159,
- \( d \) is the diameter.

Given:
- \( d = 156 \) units,

Now, calculate the circumference:

\[
C = \pi \times 156 \approx 3.14159 \times 156 \approx 490.09 \text{ units}
\]

So, the circumference of the circle is approximately **490.09 units**.

Would you like more details or have any questions about this problem?

Here are 5 related questions for further practice:
1. What is the circumference of a circle with a diameter of 200 units?
2. If the radius of a circle is 78 units, what is the circumference?
3. How do you calculate the area of a circle if the diameter is given?
4. If a circle has a circumference of 314.16 units, what is its diameter?
5. What is the difference in circumference between two circles with diameters of 156 units and 100 units?

**Tip:** Remember that the circumference of a circle is directly proportional to its diameter; doubling the diameter doubles the circumference.

Learn how to calculate the circumference of a circle when given its diameter of 156 units. Use the formula C = π × d to find the circumference, which is approximately 490.09 units. Understand the relationship between diameter and circumference in circles.

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