Geometry

2. a primitive notion that models an exact location in the space, and has no length, width, or thickness
4. the angle bounded by two lines perpendicular to each other
6. highest point;apex
9. two lines that share exactly one point
11. lines next to each to each other that don't intersect
12. measuring instrument that is used to measure angles
14. is a measurement of a plane angle in which one full rotation is 360 degrees
15. a portion cut off from a geometric figure by one or more points, lines, or planes

1. middle of a line
3. intersect at a right (90 degrees) angle.
5. straight one- dimensional figure that has no thickness and extends endlessly in both directions
7. is a device used in geometry and technical drawing, as well as the engineering and construction industries, to measure distances or draw straight lines.
8. the figure formed by two rays
10. equals two right angles
11. a plane is a flat, two-dimensional surface that extends indefinitely
13. is taken as a half-infinite line (also known as a half-line) with one of the two points and. taken to be at infinity.