Imagine you have a round cookie. The edge of the cookie is like a circle’s perimeter. When you walk around the cookie and measure how many steps you took, that’s like measuring the circumference of a circle.
To find the circumference of any circle, we use a special formula called pi. Pi is like a secret code that helps us figure out how big a circle is. The formula is C = πd, which means the circumference (C) is equal to pi (π) times the diameter (d) of the circle.
First, we need to know what the diameter is. The diameter is the distance from one edge of the circle to the other edge, passing through the center of the circle.
Once we know the diameter, we can use the formula. Let’s say the diameter of our circle is 10 units. We plug that number into the formula: C = π(10).
Next, we use the value of pi. Pi is always the same, no matter how big or small the circle is. It’s approximately 3.14. So we multiply 3.14 by 10, and we get the circumference of the circle: 31.4 units.
Also, note that we can use C = 2πr because 2r = d (where r =radius of a circle).
So the formula for the circumference of a circle can be written as:
