Across
- 3. 2D doubly ruled surface
- 4. an angle whose sides lie in opposite directions
- 7. lines that intersect at a 90 degree angle
- 10. idealization of objects which are often described in terms of two points
- 11. a measurement of a plane angle in which one full rotation is 360 degrees
- 13. middle part of a line segment
- 14. the angle bounded by two lines perpendicular to eachother
- 15. each angular point of a polygon
Down
- 1. instrument for mesuring angles
- 2. lines in a place that are always the same distance apart
- 3. a precise location or place in a plane
- 5. two lines that share one point
- 6. the figure two rays make when they meet
- 8. device used to measure distances of straight lines
- 9. a part cut off from a figure
- 12. a vector from point to point