#### Circles

This video is an introduction to finding the area and perimeter of rectangles and triangles.

## Collection Contents

### Area and Perimeter

by Sal Khan

This video tackles the basic notions of area and circumference of a circle.
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### Circles: Radius, Diameter and Circumference

by Sal Khan

This video is an introduction to finding the radius, diameter, and circumference of a circle. It is also an introduction to pi.
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### Area of a Circle

by Sal Khan

This video introduces the formula for finding the area of a circle.
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### Investigating Secants and Tangents - Geometry

by Emily Cooper

This lesson is designed for an 8th grade geometry class. It uses paper plates to look in detail at definitions of central angles, inscribed angles, secants, and tangents, then uses Geometer's Sketchpad to allow students to explore relationships between central angle measure and arc measure, etc. Finally, the students put it all together with a graphic organizer.
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