Geometry Basics Flashcards
1
Q
adjacent angles
A
two coplanar angles with a common side, a common vertex, and no common interior points
2
Q
angle
A
two rays with a common endpoint; named by its vertex
3
Q
angle bisector
A
a ray (or segment of a ray) that divides an angle into two congruent angles
4
Q
collinear points
A
points that lie on the same line
5
Q
complementary angles
A
two angles whose measures have a sum of 90°
6
Q
congruent angles
A
- angles with the same measure
- on a figure this will be shown with arcs of the same kind
7
Q
congruent segments
A
- two segments which have the same length; symbol for congruence is ≅
- on a figure this will be shown with hatch (tick) marks of the same kind
8
Q
coplanar
A
points and lines that lie in the same plane
9
Q
line
A
- a straight path that extends in two opposite directions without end (arrows on both ends) and has no thickness
- named by any two points on the line (with a small line above them)
10
Q
linear pair
A
- a pair of adjacent angles whose uncommon sides are opposite rays
- forms a straight angle
11
Q
midpoint
A
a point that divides a segment into two congruent segments
12
Q
parallel lines
A
- coplanar lines that do not intersect
- symbol is ||
13
Q
perpendicular lines
A
lines that intersect at right angles; symbol is ⊥
14
Q
plane
A
- a flat surface that extends without end and has no thickness
- contains infinitely many points and lines;
- named by a capital letter (usually script) or by at least 3 points in the plane that do not all lie on the same line
15
Q
point
A
- indicates a location and has no size; represented by a dot
- named by a capital letter
