The formula to calculate the circumference $C$ of a circle is:

$C = \pi \times d$

where $d$ is the diameter of the circle.

Given that the diameter $d = 56 \, \text{cm}$, we can substitute this into the formula:

$C = \pi \times 56$

Using $\pi \approx 3.1416$:

$C \approx 3.1416 \times 56 = 175.9296 \, \text{cm}$

Rounding to the nearest whole number, the circumference is approximately:

$C \approx 176 \, \text{cm}$

Would you like further details or have any questions?

Here are 5 related questions:

1. What is the area of the same circle?
2. If the radius of a circle is given instead, how would you find the circumference?
3. How does the circumference change if the diameter is doubled?
4. What would be the circumference if the diameter was 72 cm?
5. How do you derive the formula for the circumference of a circle?

Tip: Remember, the diameter is always twice the radius of a circle!