Geometry Vocabulary

4. when two or more lines meet or cross each other in a plane
6. two lines in a plane that do not intersect or touch each other at any point
10. two angles with a sum of 90°
12. each of the pairs of opposite angles made by two intersecting lines
14. to divide (a line, angle, shape, etc.) into two equal parts
15. an angle of 90°, in a corner of a square or at the intersection of two perpendicular straight lines
16. a collection of points that extends infinitely in two directions
19. identical in form; matching exactly when overlapped

1. having a common vertex and a common side; next to
2. an exact position or location on a plane surface. It has no size
3. is a form of angle that measures wider than 0° and less than 90°
5. two angles with a sum of 180°
7. a meeting point of two lines that form an angle
8. lines that intersect at a right (90 degrees) angle
9. middle point of a line segment; equidistant from both endpoints and bisects the segment
10. a shape with all points the same distance from its center
11. a line with an endpoint that extends infinitely in one direction
13. is a form of angle that measures wider than 90° and less than 180°
16. part of a line that is bounded by two distinct endpoints, and contains every point on the line between its endpoints
17. an angle of 180°
18. a combination of two rays (half-lines) with a common endpoint; the amount of turn between them