Across
- 1. less than 90°
- 5. The space between two intersecting lines or surfaces at or close to the point where they meet
- 6. a part, share, or number considered in comparative relation to a whole
- 9. a meeting point of two lines that form an angle.
- 10. a direct course
- 11. a mathematical concept generally regarded as a set of points having some specified structure
- 12. the center of the incircle of a triangle or other figure
- 14. a plane figure with at least three straight sides and angles, and typically five or more
- 15. a flat surface on which a straight line joining any two points on it would wholly lie.
Down
- 2. A plane figure with three sides
- 3. an instrument for measuring angles, typically in the form of a flat semicircle marked with degrees along the curved edge
- 4. the exact middle point
- 7. any of a set of straight lines passing through one point
- 8. the branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids, and higher dimensional analogs
- 13. a surface of which one end or side is at a higher level than another; a rising or falling surface.