GEOMETRY JLK

4. A geometric figure is ... if there is at least one line segment connecting interior points which passes outside of the figure
7. A line segment, line, or plane that divides a geometric figure into two congruent halves
8. Two rays sharing a common endpoint
12. The distance around the outside of a plane figure
14. A triangle which has a 90° interior angle
17. 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
18. A part of a line starting at a particular point and extending infinitely in one direction
19. A geometric figure in three dimensions excluding interior points, if any
20. A rectangle with all four sides of equal length

1. All points between two given points (including the given points themselves)
2. A flat surface extending in all directions
3. How close an approximation is to an actual value
5. Two distinct coplanar lines that do not intersect
6. An angle that has measure more than 90° and less than 180°
9. The locus of all points that are a fixed distance from a given point
10. A corner point of a geometric figure
11. The study of geometric figures in two dimensions and three dimensions
13. A unit for measuring angles
15. The points enclosed by a geometric figure
16. 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