 |
 |
 |
 |
 |
Everything Geometry
Circles - Radius and Diameter
Students should be able to:
- identify and determine relationships among the radius and diameter of a circle.
Radius and Diameter
- The diameter is the distance across a circle through the center. You can see what the diameter looks like by drawing a line through a circle, making sure it goes through the middle point, called the center.
- The radius is the distance from the center to a point on the circle. The radius is exactly half the length of the diameter.
Click the PLAY button to begin.
Interactive Circle
Use the interactive circle below to draw a radius and diameter. For the radius, click on the outside of the circle and then click the center. For the diameter, click the outside of the circle and then click on the opposite side of the circle directly across from your first point.
Click here for a larger version of this mini-movie.
Watch for the directions as you move your mouse over the circle.
More Geometry: Angles
| Basics of Geometry | Circles
| Classifying Quadrilaterals
| Classifying Triangles |
Area & Perimeter
Stay up to date on all of our new, free mini-movies and student activities as they are added to the site each month.
- Constitution Webquest
- Slavery in America
- Waves of Immigration
- Declaration of Independence
More Social Studies activities
...