25 Geometry Terms
plane
a flat surface made of points
linear pair
a pair of adjacent angles whose non common sides are opposite rays
Angle Bisector
a ray that divides an angle into two congruent angles
segment bisector
a segment, line, or plane that intersects a segment at its midpoint
polyedron
a solid with all flat surfaces that enclose a single region of space.
degree
a unit of measure used in measuring angles and arcs
regular polygon
all sides are equal, all angles are equal. CONVEX ONLY
line segment
can be measured because it has two endpoints
polygon
closed figure, sides are all segments can be concave orconvex
angle
formed by two non colinear rays that have a common endpoint
congruent
having the same measure
perpendicular
lines that form right angles
line
made up of points has no thickness or width
Concave Polygon
no diagonals outside the figure
Concave Polygon
one or more diagonals outside the figure
ray
part of a line
undefined term
point, line and plane. (only been defined using examples and descriptions)
coplanar
points that lie on the same plane
vertex
the common endpoint
midpoint
the point halfway between the endpoints of a sement
Perimeter
the sum of all the sides of a polygon
adjacent angles
two angles that have a common vertex, lie on the same plane, and have a common side but no interior points
supplementary angles
two angles whose measures have a sum of 180
complementary angles
two angles whose measures have a sum of 90
vertical angles
two non adjacent angels formed by two intersecting lines