Geometry Lesson 1.1 Vocabulary, Geometry Lesson 1.2 Vocabulary, Geometry Lesson 1.3 Vocabulary, Geometry Lesson 1.4 Vocabulary, Geometry Lesson 1.5 Vocabulary
Collinear
Located on the same line.
Coplanar
Located on the same plane.
Equiangular polygon
is a polygon with all angles equal in measure.
Equilateral polygon
is a polygon with all sides equal in length.
Regular polygon
is a polygon with that has all sides and angles equal in size or measure.
Vertex of an angle
is a the common endpoint of the two rays of an angle.
Angle
is formed by two rays that share a common endpoint provided that the two rays are nonlinear.
Perimeter
is the distance around the outside of the polygon.
Reflex Measure
is the largest amount of rotation about the vertex between the two sides of the angle.
Measure of an angle
is the smallest amount of rotation about the vertex between the two sides of the angle.
Degrees
is the unit of measurement for angles.
Consecutive
means next to.
Line
A straight, continuous arrangement of infinitely many points. It has infinite length and extends forever in both directions.
Acute Triangle
A triangle with all acute angles.
Equilateral Triangle
A triangle with all congruent sides.
Isosceles Triangle
A triangle with at least two congruent sides.
Obtuse Triangle
A triangle with exactly one obtuse angle.
Right Triangle
A triangle with exactly one right angle.
Scalene Triangle
A triangle with no congruent sides.
Consecutive vertices
means vertices that are next to each other.
Perpendicular lines
must be marked
Parallel lines
must be marked.
Perpendicular Lines
must meet at a 90° angle. We use ⊥ to represent it.
Adjacent Angles
must share a vertex and a side.
Intesecting lines
only intersect at one point.
Geometry
The study of earth measure.
Ray
A ray contains an endpoint and all the collinear points on the same side of that endpoint.
Line Segment
Consists of two points called endpoints and all the points between them are collinear with the two endpoints.
Plane
Has length and width but no thickness. It is a flat surface that extends infinitely in both directions.
Point
Has location, but no size.
Decagon
Polygon with 10 sides
Undecagon
Polygon with 11 sides
Dodecagon
Polygon with 12 sides
Triangle
Polygon with 3 Sides
quadrilateral
Polygon with 4 Sides
Pentagon
Polygon with 5 Sides
Hexagon
Polygon with 6 Sides
Heptagon
Polygon with 7 Sides
Octagon
Polygon with 8 sides
Nonagon
Polygon with 9 sides
n-gon
Polygon with n sides
Congruent Line Segments
These have equal measure or equal length.
Midpoint
This is a point on a segment that is the same distance from both endpoints.
Bisect
This means to divide into two equal parts.
Protractor
a geometric tool used to measure angles.
Diagonal
a line segment that connects two non consecutive vertices
Vertical Angles
a pair of angles formed by two intersecting lines that share a common vertex but not a common side.
Linear Pair
a pair of angles that share a vertex and a side. Their non common side must form a line.
Supplementary Angles
a pair of angles that sum to 180°.
Complementary Angles
a pair of angles that sum to 90°.
Points on a line
are collinear.
Skew Lines
are lines that do not intersect and are non coplanear.
Congruent parts of figures
are marked with hash marks.
Lines
are straight.
Good Definition has
classification, differentiation, and can be tested.
Convex Polygons
contains all diagonals inside of the polygon.
Ray
contains an endpoint and all the collinear points on one side of that endpoint.
Congruent Angles
exist if and only if they have equal measure. This is shown using identical markings. This ≅ is the symbol used.
Parallel Lines
exist in the same plane that never meet. We use II to represent it. Need arrows on picture to visually represent it.
Acute Angle
has a measure less than 90°.
Obtuse Angle
has a measure more than 90° but less than 180°.
Right Angle
has a measure of 90°.
Concave polygons
have at least one diagonal outside of the polygon.
Congruent polygons
have the exact same size and shape.
Angle Bisector
if it contains the vertex and divides the angle into two equal parts.
Midpoint
is a point that divides a line segment into two congruent parts.
Counterexample
something that would fit your definition, but is not what you are trying to define.
Vertices of a polygon
the endpoint where the sides meet.
Segment addition
the total is the sum or length of the two parts.