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# Geo.H. Chapter 2 Voc

### Geometry Honors: Chapter 2 Vocabulary

3 undefined terms point, plane, line
basic unit of geometry; indicates location; infinately small; labek with a capital letter point
straight arrangement of points which is infinate in length; no end points; label with points line
flat surface; infinate length and width plane
statement that explains the meaning of a word; places a word in a large group but identifies its unique characteristics definations
set of all points space
points that lie on the same line collinear points
points that lie on the same plane coplaner
straight arrangemen of points with 2 endpoints; name with 2 endpoints segment
distance between endpoints length of a segment
straight arrangement of points with 1 endpoint; name with endpoint ray
2 rays that share a common endpoint angle
degree of rotation between the 2 rays, between 0 and 180 degrees measure of an angle
the instrument used to measure an angle protractor
figures that are the same size and the same shape congruent figures
segments that have the same length congruent segments
angles that have the same measure congruent angles
a polygon with 3 sides triangle
"if-then" definition; ex; if a polygon is a triangle- then it has 3 sides biconditional definition
swithes "if then" definitions; ex: if a polygon has 3 sides, then it is a triangle converse
an angle that measures 90 degrees Right Angle
an angle thats measurement is less than 90 degrees and greater thatn o degrees Acute Angle
an angle thats measurement is greater thatn 90 degrees and less than 180 degrees obtuse angle
the point on a segment that is the same distance from each endpoint midpoint of a segment
a ray that begins at the vertex and divides the angle's measure in half angle bisector
coplaner lines that do not intersect parallel lines
lines that intersect to form a 90 degree angle perpendicular lines
2 angles whose measurements add to 90 degrees pair of complementary angles
two angles whose measurements add to 180 degrees pair of supplementary angles
a pair of intersecting lines that share a common vertex but are non-adjacent vertical angles
a pair of adjacent angles that form a linear pair; they share a common and a common side Linear pair of angles
closed figures; made ip of segments; named by number of sides polygons
# of sides = # of vertices = # of _____ angles
sides of polygons are _______ segments
________ is a point where 2 sides meet vertex
sum of all sides of a polygon perimeter
in a polygon, consecutive sides share a common____. vertex
In a polygon, consecutive angles share a common ________. side
polygons with corresponding sides and corresponding angles congruent polygons
a segment connecting non-adjacent vertises diagonal of a polygon
polygons whose sides have the same measure equilateral polygons
polygons whose angles have the same measure equiangular polygons
polygon that is both equilateral and equiangular regular polygon
polygon with 3 sides triangle
polygon with 5 sides pentagon
polygon with 6 sides hexagon
polygon with 7 sides heptagon
polygon with 8 sides octagon
polygon with 9 sides nonagon
polygon with 10 sides decagon
polygon with 11 sides undecagon
polygon with 12 sides dodecagon
triangle with one right angle right triangle
triangle with all 3 angles less tthan 90 degrees acute triangle
triangle with 1 obtuse angle obtuse angle
to have a single point of intersection concurrent
trianle with no equal sides scalene triangles
triangle with at least 2 congruent sides isosceles
angle formed by 2 sides of equal length vertex angle
side opposite a vertex angle base
angles at the endpoint of base base angle
segment from an vertex to the midpoint of opposite side median
segment from a vertex perpendicular to the opposite side altitude
A quadrilateral with 1 pair of opposite parallel Trapezoids