Geo 1 Flashcards
A location
Point
Straight path of points that infinitely long
Line
A flat surface of points that’s infinitely large
Plane
Three or more points on the same line
Collinear points
Three or more points not on the same line
Noncollinear points
Part of a line with one endpoint
Ray
A point on the end of a segment or a ray
Endpoint
Part of a line with two endpoints/2 points on a line and all the points in between
Segment
Lines in the same plane that do not intersect
Parallel lines
Lines not on the same plane that do not intersect
Skew lines
Line segments that have the same length
Congruent segments
A point that divides a segment into two congruent segments
Midpoint
A figure formed from two rays that share the same in point
Angle
The common endpoint shared by the two rays of an angle
Vertex
Lines that intersect to form right angles
Perpendicular lines
Two angles with measures that add up to 90°
Complementary angles
Two angles with measures that add up to 180°
Supplementary angles
Adjacent supplementary angles
Linear pair
A ray that divides an angle into two congruent angles
Angle bisector
Angles that share a vertex and share a side but do not overlap
Adjacent angles
The non-adjacent angles that are formed when two lines intersect
Vertical angles
A line that intersects with two or more lines
Transversal
Angles on the inside
Interior angles
Angles on the outside
Exterior angles
Three sided polygon
Triangle
All angles less than 90°
Acute triangle
One right angle
Right Triangle
One obtuse angle
Obtuse triangle
No congruent sides
Scalene triangle
At least two congruent sides
Isosceles triangle
All congruent sides
Equilateral triangle
A close figure formed by segments
Polygon
All sides and angles are congruent
Regular polygon
A segment connecting two nonconsecutive vertices in a polygon
Diagonal
All the points in a plane a given distance from a given point
Circle
The given point in a plane
Center of a circle
A segment with one endpoint at the center and one endpoint on the circle
Radius
A segment with both endpoints on the circle
Chord
A chord that goes through the center of a circle
Diameter
Part of the circle
Arc
Half of the circle. The ends of a diameter divide the circle and semicircles
Semicircle
The distance around a circle
Circumference
The ratio of circumference to diameter
Pi
