Learn about Circumference Applications Find the Circumference In this problem, it says that the diameter of a bicycle wheel is 26 inches. Estimate the circumference of the wheel. Here we have a diagram of a wheel and a bicycle wheel is circular in shape and a circle is a round figure with one round edge. It does not have any sides or angles. Now, the perimeter of a circle has a special name and the perimeter of the circle is called the circumference. The circumference of a circle is the distance around the circle. The diameter of a circle is any line segment that passes through the center of the circle and touches both endpoints of the circle. This is a diameter of a circle. It’s any line segment that passes through so it has to go through the center of the circle and it has to the other end point of the circle. Now, the radius of a circle is a line segment in which one endpoint at the center of the circle and the other endpoint is at the end of the circle. So, a radius will start from the center out. So, this would be the radius. The radius goes from one endpoint in the center of the circle to the end of the circle. Now, back to our problem with the estimating the circumference of the wheel, the circumference of a bicycle wheel can be measured with a tape measure. Here’s an example of a bicycle wheel. The circumference of the bicycle wheel is the length around the edge when measured with a tape measure. We wrap the tape around the bicycle wheel and record the measurement of the tape; this is the circumference of the cylinder. The circumference of the bicycle wheel is about 78 inches; this would be the circumference of the bicycle wheel. Diameter, remember is the line segment that passes to the center and each endpoint touches the edge of the circle, so its diameter is about 26 inches. Now note that the circumference of the circle is about 3 times the diameter. So, a rule to remember that the circumference of a circle is about 3 times the diameter. So, if you know the diameter, you can find what about an estimate of the circumference by multiplying. So, the circumference would equal three times the diameter. Things to keep in mind; the circumference of a circle is the distance around the circle. The circumference of the bicycle wheel is the length around its round edge when measured by tape. The diameter of a circle is any line segment that passes through the center of the circle and touches both endpoints of the circle and the circumference of a circle is about 3 times the diameter. So remember, the circumference of a circle is about three times the diameter.