Geometry Definitions

3. A line that cuts across two or more (usually parallel) lines.
5. The property that states that if you add the same number to both sides of an equation, the sides remain equal
6. a point at or near the middle of, or equidistant from, both ends, as of a line
7. the extent or amount of space between two things, points, lines, etc.
8. a rectangle having all four sides of equal length.
9. States that when both sides of an equation have the same number subtracted from them, the remaining expressions are still equal
11. the pairs of angles on opposite sides of the transversal but outside the two lines
16. states that for all real numbers x and y, if x = y, then y = x.
17. the space within two lines or three or more planes diverging from a common point, or within two planes diverging from a common line.
18. a quadrilateral plane figure having two parallel and two nonparallel sides.
19. if you divide both sides of an equation by the same nonzero number, the sides remain equal.
21. the angles that occupy the same relative position at each intersection where a straight line crosses two others
22. states that for all real numbers x, y, and z,
23. each of the pairs of opposite angles made by two intersecting lines.

1. a line of sight.
2. states that for every real number x, x = x
4. the line segment connecting the midpoints of two sides of a triangle.
6. if you multiply both sides of an equation by the same number, the sides remain equal
10. either of two angles whose sum is 90°.
11. are the angle pairs that on the inside of the two lines
12. a parallelogram having four right angles.
13. If a = b, then a can be substituted for b in any equation or expression
14. is a ratio of the lengths of two sides of a right triangle
15. an oblique-angled equilateral parallelogram; any equilateral parallelogram except a square.
20. he highest point of something; apex; summit; top