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Geometry
terms and defintions
22
Mathematics
8th Grade
10/01/2008

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Term
POINT
Definition

INDICATES LOCATION, HAS NO SIZE OR DIMENSION

REPRESENTED BY A DOT AND CAPITAL LETTER

Term
LINE
Definition
A SET OF CONTINUOUS POINTS
Term
PLANE
Definition
FLAT SURFACE, NO THICKNESS, EXTENDS WITHOUT ENDING IN ALL DIRECTIONS
Term
LINE SEGMENT
Definition
PART OF A LINE, CONTAINS TWO END POINTS
Term

RAY

Definition
PART OF A LINE, CONTAINS ONE END POINT, WITHOUT ENDING IN ONE DIRECTION
Term
OPPOSITE RAYS
Definition
RAYS THAT SHARE AN END POINT AND FORM A LINE
Term
ANGLE
Definition
TWO RAYS WITHOUT COMMON ENDPOINTS (VERTEX), RAYS ARE CALLED THE SIDE OF THE ANGLE
Term

COLLINEAR POINTS

Definition
POINTS THAT LIE ON THE SAME LINE
Term
ACUTE
Definition
LESS THAN 90 DEGREES
Term
RIGHT ANGLE
Definition
90 DEGREES
Term
OBTUSE ANGLE
Definition
MORE THAN 90 DEGREES
Term
STRAIGHT ANGLE
Definition
EQUALS 180 DEGREES
Term
REFLEX ANGLE
Definition
GREATER THAN 180 DEGREES, BUT LESS THAN 360 DEGREES
Term
COMPLEMENTARY
Definition
ANGLES ADD UP TO 90 DEGREES
Term
SUPPLEMENTARY
Definition
ANGLES ADD UP TO 180 DEGREES
Term
ADJACENT
Definition
COMMON VERTEX, COMMON SIDE, NO COMMON INTERIOR POINT (NEXT TO EACH OTHER)
Term
VERTICAL
Definition
FORMED WHEN TWO LINES INTERSECT, OPPOSITE ANGLES
Term
LINEAR PAIR
Definition
ADJACENT ANGLES THAT FORM A STRAIGHT LINE
Term
PERPENDICULAR
Definition
LINES THAT INTERSECT AND FORM RIGHT ANGLES
Term
MIDPOINT
Definition
DIVIDES A LINE SEGMENT INTO TWO EQUAL SEGMENTS
Term
PARALLEL
Definition
LINES THAT NEVER INTERSECT
Term
TRANSVERSAL
Definition
A THIRD LINE THAT CUTS TWO LINES FORMING RIGHT ANGLES
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