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# NorthCrawford GeoCh1

### Tools of Geometry

TermDefinition
net Two-dimensional diagram that you can fold to form a three-dimensional figure
isometric drawing drawing that shows the corner view of a three-dimensional figure
orthographic drawing another way to represent a three-dimensional figure
point indicates a location and has no size
line a straight path that extends in two opposite directions without an end and has no thickness
plane flat surface that extends without an end and has no thickness
collinear points points that lie on the same line
coplanar points and lines that lie in the same plane
ray part of a line that only has one endpoint
opposite rays two rays that share the same endpoint and form a line
space set of all points in a three-dimensional figure
segment part of a line that has two endpoints
postulate accepted statement of fact
axiom accepted statement of fact
segment bisector the point, line, or segment that bisects another line or segment
vertex of an angle endpoint of an angle
measure of an angle Consider ray OD and point C on one side of ray OD. Every ray of the form ray OC can be paired one to one with a real number from 0 to 180. The measure of angle COD is the absolute value of the difference of the real numbers paired with ray OC and ray OD
congruent angles angles that are equal
acute angles angle that is less than 90 degrees
right angles angle that equals 90 degrees
obtuse angles angle that is more than 90 degrees
straight angles angle that is equal to 180 degrees
vertical angles two angles whose sides are opposite rays
supplementary angles two angles that have the sum of 180 degrees
complementary angles two angles that have the sum of 90 degrees
adjacent angles two coplanar angles with a common side or vertex and no common interior points
linear pair pair of adjacent angles whose noncommon sides are opposite rays
angle bisector line or segment that divides an angle in half
construction geometric figure drawn using a straightedge or compass
perpendicular lines two lines that intersect forming right angles
perpendicular bisector line, segment, or ray that is perpendicular to the segment at its midpoint
congruent segments segments that are the same length
intersection set of points the figure has in common
coordinate the number that corresponds to a point
distance area between two points
midpoint the center of a point, line, or any other segment
Created by: mbuening