geometry crossword

4. a unit of measurement of angles
5. a dot or other punctuation mark, in particular a period
6. an instrument for measuring angles, typically in the form of a flat semicircle marked with degrees along the curved edge.
7. any of a set of straight lines passing through one point
8. the space measured in degrees between two intersecting lines
9. flat surface on which a straight line joining any two points on it would wholly lie
12. a straight strip to draw straight lines or measure distances
15. when two or more lines meet or cross each other in a plane

1. lines that intersect at a right 90 degrees angle
2. each angular point of a polygon, polyhedron, or other figure
3. an angle whose sides lie in opposite directions from the vertex in the same straight line
6. lines in a plane that are always the same distance apart
10. a part of a figure cut off by a line or plane intersecting it
11. the shortest distance between any two points
13. the exact middle point of a segment
14. an angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines