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geometry vocab chp 1

the language of geometry

TermDefinition
POINT AN EXACT LOCATION IN SPACE WITH INDEFINITE SHAPE AND SIZE
LINE AN OBJECT WITH NO THICKNESS THAT EXTENDS INFINITELY IN TWO DIRECTIONS
PLANE A FLAT SURFACE THAT EXTENDS INFINITELY IN ALL DIRECTIONS
COLLINEAR POINTS THAT LIE ON THE SAME LINE
COPLANAR POINTS THAT LIE ON THE SAME PLANE
SEGMENT A “PIECE” OF A LINE CONSISTING OF 2 ENDPOINTS AND ALL POINTS IN BETWEEN.
RAY A “PIECE” OF A LINE THAT BEGINS AT A CERTAIN POINT KNOWN AS AN ENDPOINT AND EXTENDS INFINTELY IN ONE DIRECTION
ANGLE THE UNION OF TWO RAYS WITH A COMMON ENDPOINT
OPPOSITE RAYS TWO RAYS SHARING AN ENDPOINT AND CONTINUING INFINITELY IN OPPOSITE DIRECTIONS
SKEW LINES NON – COPLANAR LINES THAT NEVER INTERSECT
PARALLEL LINES TWO OR MORE COPLANAR LINES THAT HAVE NO POINTS IN COMMON OR ARE IDENTICAL
PERPENDICULAR LINES TWO SEGMENTS, RAYS, OR LINES ON THE SAME PLANE THAT INTERSECT AND FORM RIGHT ANGLES
PARALLEL PLANES PLANES THAT HAVE NO POINTS IN COMMON
NON COLLINEAR POINTS THAT DO NOT LIE ON THE SAME LINE
TRIANGLE A PLANE FIGURE WITH THREE STRAIGHT SIDES AND THREE ANGLES
HEXAGON A POLYGON WITH SIX SIDES
NONAGON A POLYGON WITH NINE SIDES
HEPTAGON A POLYGON WITH SEVEN SIDES
DECAGON A POLYGON WITH TEN SIDES
PENTAGON A POLYGON WITH FIVE SIDES
OCTAGON A POLYGON WITH EIGHT SIDES
DODECAGON A POLYGON WITH TWELVE SIDES
SEGMENT ADDITION POSTULATE If Q is between P & R, then PQ + QR = PR If PQ + QR = PR, then Q is between P & R.
MIDPOINT THE POINT ON A SEGMENT THAT SPLITS THE SEGMENT INTO TWO EQUAL PARTS
ANGLE ADDITION POSTULATE If D is in the interior of ∠ABC, then m∠ABD+m∠DBC=m∠ABC
ANGLE BISECTOR A RAY THAT SPLITS AN ANGLE INTO TWO EQUAL PARTS
UNDECAGON A POLYGON WITH ELEVEN SIDES
Created by: mokelly