Summary
Highlights
Calculating Circumference Given the Radius00:00:00
The video begins by defining the radius and circumference of a circle. The formula for circumference (C = 2πr) is introduced, and an example with a radius of 3 centimeters is solved, yielding an approximate circumference of 18.85 centimeters.
Calculating Circumference Given the Diameter00:01:46
The second section explains how to find the circumference when given the diameter. The relationship between diameter and radius (d = 2r) is highlighted. Using a diameter of 10 inches, the radius is found to be 5 inches, and the circumference is calculated as 10π inches or approximately 31.4 inches.
Calculating Circumference Given the Area00:03:30
The final part of the video demonstrates how to calculate the circumference when only the area of the circle is provided. The formula for the area of a circle (A = πr²) is used to first find the radius. Given an area of 113.097 square feet, the radius is approximately 6 feet. This radius is then used with the circumference formula to find an approximate circumference of 12π feet or 37.7 feet.