Term | Definition |
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 |