## Circles 1 - Circumference and Area

Circles 1 - Circumference and Area
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Part of video series Circumference and Area of Circles
Taught by YourMathGal

### Meets NCTM Standards:

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com
Easy formulas and examples for circumference and area of a circle: C = 2r * pi and A = r^2 * pi;
• Diameter of a circle - A description and explanation of what the diameter of a circle is and how to calculate other measurements from the diameter.
• Circumference of a circle - Definition of circumference of a circle, how to find it, and some interesting facts about circumference.
• Area of a circle - The definition of area of a circle as well as explanations of how to find the area of a circle is shown with several formulas.
• What is the circumference of a circle?
• What is the formula for the circumference of a circle?
• What is the exact circumference of a circle if its radius is 5 feet?
• How can you approximate the circumference of a circle using 3.14 as pi?
• How do you find the area of a circle?
• What is the formula for the area of a circle?
• How do you find the exact area of a circle if its radius is 5 feet?
• How can you approximate the area of a circle using 3.14 as pi?
• How can you remember the formulas for circumference and area of a circle?
• How can you find the exact circumference and area of a circle if r = 3?
This idea of circumference / distance around / perimeter of a circle is explained in this lesson. An example problem of finding the circumference of circles is shown and explained. This is a good introductory tutorial on finding circumference. Area of a circle is also explained and an example problem is shown.
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Reviewed by MathVids Staff on March 13, 2010.  