The following are links to particularly helpful lesson videos in Khan Academy. All Khan Academy content is available for free at www.khanacademy.org.
| Title of Khan's Geometry Video | Length | |
|---|---|---|
| 1 | Perimeter and Area Basics | 8:25 |
| 2 | Area and Perimeter | 12:20 |
| 3 | Perimeter of a Polygon | 1:20 |
| 4 | Perimeter and Area of a Non-Standard Polygon | 3:03 |
| 5 | Circles: Radius, Diameter and Circumference | 11:05 |
| 6 | Parts of a Circle | 2:01 |
| 7 | Area of a Circle | 2:44 |
| 8 | Solid Geometry Volume | 3:56 |
| 9 | Cylinder Volume and Surface Area | 8:07 |
| 10 | Volume of a Sphere | 2:35 |
| 11 | Angle Basics | 6:49 |
| 12 | Measuring Angles in Degrees | 8:22 |
| 13 | Using a Protractor | 3:25 |
| 14 | Measuring Angles | 4:05 |
| 15 | Angle-a-trons | 2:04 |
| 16 | Acute Right and Obtuse Angles | 5:32 |
| 17 | Complementary and Supplementary Angles | 8:31 |
| 18 | Angles (part 2) | 9:05 |