Geometry All Vocab Flashcards
3 Undefined Terms
Line, Point, and Plane
Point
A location. Named with a capital letter
Line
A straight path of points that is indefinitely long. Named with any 2 points on the line
Plane
A flat surface of points that is indefinitely long. Named with any non-collinear points on the plane
Collinear Points
3 or more points on the same line
Non-Collinear Points
3 or more points not connected on the same line(cannot be connected by one line)
Ray
Part of a line with an end point. Name with endpoint and one “direction point”
Endpoint
Point on the end of a segment or ray
Segment
Part of a line with 2 end points
Parallel Lines
Lines on the same plane that don’t intersect
Skew Lines
Lines that aren’t in the same plane that don’t intersect
Parallel Planes
Planes that don’t intersect
Congruent Segments
Line segments that have the same length
Midpoint
A point that divides a segment into 2 congruent segments
Angle
A figure formed from to rays that shares the same endpoint
Vertex
Common endpoint shared by 2 rays of an angle
Acute Angle
An angle with a measure less than 90 degrees
Right Angle
An angle with a measure of 90 degrees
Obtuse Angle
An angle with a measurement between 90 and 180 degrees
Straight Angle
An angle with a measure of 180 degrees
Perpendicular Lines
Lines that intersect to form right angles
Complimentary Angles
2 angles with measures that add up to 90 degrees
Supplementary Angles
2 angles with measures that add up to 180 degrees
Linear Pairs
Adjacent Supplementary Angles
Angle Bisector
A ray that divides an angle into two congruent angles
Adjacent Angles
Angles that have a common vertex and side, but they don’t overlap
Vertical Angles
The non-adjacent angles formed b two intersecting lines
Transversal
A line that intersects 2 or more other lines
Interior Angles
Angles that are inside the parallel lines when there is a transversal line
Exterior Angles
Angles that are outside the parallel lines when there is a transversal line
Triangle
A three sided polygon. Name using 3 verticies
Acute Triangle
Triangles w all angles less than 90 degrees
Right Triangle
A triangle with one right angle
Obtuse Angle
A triangle with one obtuse angle
Isosceles Triangle
A triangle with at least 2 congruent sides
Scalene Triangle
A triangle with no congruent sides
Equilateral Triangle
A triangle with all sides congruent(all measures of angles 60)
No sides congruent…
No angles congruent
Two sides congruent…
Two angles congruent
All/3 sides congruent…
All/3 angles congruent
Polygon
A closed figure with 3 or more sides formed by conjoining segments
Regular Polygon
A polygon with all sides congruent and all angles congruent
Irregular Polygon
A polygon without all angles and/or sides congruent
Diagonal
A segment connecting two non-consecutive vertices in a polygon
Circle
All the points in a plane a given distance from a given point
Center of a circle
The given point in a plane
Radius
A segment with one endpoint at the center of a circle and one endpoint on the circle
Chord
A segment with both endpoints on the circle
Diameter
A chord that goes through the center of a circle
Arc
Part of a circle
Semicircle
Half the circle the ends of the diameter divide the circles into semicircles
Circumference
The distance around a circle
Quadrilateral
A polygon with 4 sides
Trapezoid
Quadrilateral with exactly one pair of sides parallel
Coplanar Points
3 or more points on the same plane
Isosceles Trapezoid
A quadrilateral exactly one pair of parallel sides the other non-parallel sides congruent
Parallelogram
A polygon with both pairs of opposite sides parallel and congruent
Rectangle
A parallelogram with 4 right angles
Rhombus
Parallelogram with all sides congruent
Square
Quadrilateral with all sides and all angles congruent
