# Geometry Definitons

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1. Point:
• Exact location
• Ordered pair of coordinates
2. Parallel lines
two coplanar lines that either have no points in common or are identical
3. Distance
absolute value of the difference of two coordinates
4. Convex set:
set in which all segments connecting points of the set lie entirely in the set
5. counterexample:
situation where the antecedent (if part) is true but the consequent (then part) is false
6. Converse:
converse of P -->Q is Q -->P
7. Midpoint:
point on segment AB where AM = AB
8. Circle:
set of all points in a plane a certain distance (radius) from a certain point (center)
9. Union:
Intersection:
• AUB, is the set of elements which are either in A or in B or in both A and B
• AnB, set of elements which are in both A and B
10. Polygon:
union of three or more segments in the same plane such that each segment intersects exactly two others @ their endpoints
11. Angle:
union of two rays that have the same endpoint
12. Zero:
Acute:
Right:
Obtuse:
Straight:
• if and only if m=0o
• " " 0<m<90o
• " " m=90o
• " " 90<m<180o
• " " m=180o
13. Complementary:
Supplementary:
• M1+M2=90o
• M1+M2=180o
14. Bisector:
when an angle is split exactly in half on the interior side
15. Proof:
Sequence of justified conclusions, leading from the antecedent to the consequent.
16. Slope:
y1-y2/x1-x2
17. Perpendicular lines:
Two segments, rays, or lines that form a 90o angle.
 Author: mathlover1 ID: 32098 Card Set: Geometry Definitons Updated: 2010-09-12 21:12:18 Tags: geometry definitions Folders: Description: Geometry Definitions Starting in Chapter 1...added over time. There are a few descriptions based on Euclid's geometry. Show Answers: