GEOMETRY Kosiński

3. The points enclosed by a geometric figure
5. A rectangle with all four sides of equal length
6. A line segment, line, or plane that divides a geometric figure into two congruent halves
8. Two distinct coplanar lines that do not intersect
10. A geometric figure is ... if there is at least one line segment connecting interior points which passes outside of the figure
11. All points between two given points (including the given points themselves)
13. A unit for measuring angles
14. A part of a line starting at a particular point and extending infinitely in one direction
15. A geometric figure in three dimensions excluding interior points, if any
16. How close an approximation is to an actual value
19. A geometric figure with no indentations. Formally, a geometric figure is convex if every line segment connecting interior points is entirely contained within the figure's interior

1. An angle that has measure more than 90° and less than 180°
2. A triangle which has a 90° interior angle
4. A corner point of a geometric figure
7. The study of geometric figures in two dimensions and three dimensions
8. The distance around the outside of a plane figure
9. A transformation that is invariant with respect to distance. That is, the distance between any two points in the pre-image must be the same as the distance between the images of the two points
12. A flat surface extending in all directions
17. The locus of all points that are a fixed distance from a given point
18. Two rays sharing a common endpoint