Unit 1: Intro to Geometry
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20 Terms
Point
a specific location in space
Line
a series of points that extends in two opposite directions without end
Plane
a flat surface that extends forever in all directions
Segment
a part of a line consisting of two endpoints and all points between them
Ray
a part of a line consisting of one endpoint and all points of the line on one side of the endpoint
Angle
formed by two rays with the same endpoint
Intersection
the point where two lines cross
Vertex of an angle
The common endpoint of the two rays that form an angle
Collinear
points on the same line
Coplanar
on the same plane
Midpoint
a point that divides a segment into two equal parts
Segment Bisector
a line, ray, or segment that divides a segment into two equal parts
Angle Bisector
a ray that divides an angle into two equal parts
Congruent
having the same size and shape
Perpendicular Lines
Lines that intersect at a right angle
Parallel Lines
Lines that never intersect and are coplanar.
Acute Angle
An angle that measures less than 90 degrees.
Obtuse Angle
An angle that is greater than 90 degrees
Right Angle
An angle that measures exactly 90 degrees.
Straight Angle
An angle that measures exactly 180 degrees.