G.CO.1
Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.
| 1. | Phoebe's Quirky Quadrilateral Quandaries 2 - sides and angles of a parallelogram | |
| 2. | Phoebe's Quirky Quadrilateral Quandaries 1 - angle sum of a quadrilateral | |
| 3. | Circular Logic 4 - identify correct circle geometry theorem | |
| 4. | Circular Logic 5 - concyclic quadrilaterals | |
| 5. | Circular Logic 3 - angle at circumference of circle | |
| 6. | Circular Logic 2 - angle in a semicircle | |
| 7. | Circular Logic 1 - identify correct circle geometry theorem | |
| 8. | Circular Logic 6 - radius through the midpoint of a chord | |
| 9. | Circular Logic 9 - chords of the same length | |
| 10. | Circular Logic 8 - perpendicular to chord through center | |
| 11. | Circular Logic 7 - radius perpendicular to chord |