ACT SAT Prep Learn how to determine the circumference of a circle

The video tutorial explains how to calculate the circumference of a circle. It begins by defining key terms such as radius and diameter. The radius is the distance from the center to any point on the circle, while the diameter is the distance across the circle through the center. The tutorial then introduces the formulas for calculating the area and circumference of a circle. The area is given by πR², and the circumference is calculated using 2πR or π times the diameter. An example is provided where the radius is 4 inches, leading to a circumference of 8π.

Explain the difference between the diameter and the radius of a circle.

What is the formula for calculating the area of a circle?

What does the term 'circumference' refer to in relation to a circle?

How do you calculate the circumference of a circle?

If the radius of a circle is 4 inches, what is the circumference?