Across
- 3. exactly equal to 180 degrees
- 4. all sides are the same on this triangle
- 5. greater than 180 degrees degree and less than 360 degrees
- 7. 1 curved surface, 2 flat faces, no vertex
- 8. opposite sides are equal and parallel to each other and 2 symmetry lines
Down
- 1. twice the length of a radius
- 2. perimeter of a circle
- 6. an angle less than 90 degree