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# GEOMETRY - TERMS

### TERMINOLOGY - LINES AND ANGLES

POINT MARKS AN EXACT LOCATION
LINE A COLLECTION OF POINTS IN A STRAIGHT PATH EXTENDING ENDLESSLY IN BOTH DIRECTIONS
LINE SEGMENT PART OF A LINE BETWEEN TWO POINTS
RAY PART OF A LINE WITH ONE ENDPOINT THAT EXTENDS ENDLESSLY IN ONE DIRECTION
ANGLE FORMED BY TWO RAYS WITH THE SAME ENDPOINT CALLED A VERTEX
VERTEX END POINT SHARED BY TWO RAYS
CONGRUENT ANGLES TWO ANGLES HAVING THE SAME MEASURE
LINEAR PAIR 2 supplementary adjacent angles whose noncommon sides form a line
VERTICAL ANGLE ANGLES ON OPPOSITE SIDES OF THE INTERSECTION OF TWO LINES
ADJACENT ANGLES 2 nonstraight and nonzero angles that have a common side in the interior of the angle formed by the noncommon sides
CORRESPONDING ANGLES any pair of angles in similar locations with respect to a transversal
TRANSVERSAL a line that intersects 2 others
ALTERNATE INTERIOR ANGLES - interior angles on alternate sides of the transversal (not on the same parallel line)
ALTERNATE EXTERIOR ANGLE - exterior angles on alternate sides of the transversal (not on the same parallel line)
SUPPLEMENTARY ANGLES TWO ANGLES WHOSE SUM IS 180 DEGREES
COMPLIMENTARY ANGLES TWO ANGLES WHOSE SUM IS 90 DEGREES
BISECT DIVIDE AN ANGLE OR SEGMENT INTO TWO CONGRUENT ANGLES OR SEGMENTS
PLANE AN INFINITE FLAT SURFACE
PARALLEL LINES LINES ON A PLANE THAT NEVER MEET
TRANSVERSAL LINE THAT INTERSECTS TWO OR MORE PARALLEL LINES
CORRESPONDING ANGELS ANGLES FORMED BY TWO LINES AND A TRANSVERSAL
MIDPOINT THE POINT THAT DIVIDES A SEGMENT INTO TWO CONGRUENT SMALLER SEGMENTS
PERPENDICULAR LINES LINES, RAYS, OR LINE SEGMENTS THAT INTERSECT AT RIGHT ANGLES
PERPENDICULAR BISECTOR A LINE, RAY OR SEGMENT THAT INTERSECTS A SEGMENT AT ITS MIDPOINT AND IS PERPENDICULAR
SKEW LINES TWO LINES THAT DO NOT INTERSECT AND ARE NOT PARALLEL; non-coplanar (NOT WITHIN THE SAME PLANE) lines that don't intersect
QUADRALATERAL A FOUR SIDED FIGURE (E.G. RECTANGLE, PARALLELOGRAM, RHOMBUS, TRAPEZOID); THE SUM OF THE MEASURES OF THE ANGLES OF ANY QUADRALATERAL IS 360 DEGREES; ANY QUADRALATERAL CAN BE DIVIDED INTO TWO TRIANGLES
PARALELLOGRAM a quadrilateral with two pair of parallel sides and two pair of congruent sides
RHOMBUS a parallelogram with four congruent sides
TRAPEZOID a quadrilateral that has ONLY one pair of parallel sides
Isoscoles trapezoid a trapezoid that has a pair of equiangular base angles
Isoscoles triangle a triangle with two sides of equal length
RECTANGLE A PARALLELOGRAM WITH FOUR RIGHT ANGLES
POLYGON A GEOMETRIC FIGURE WITH AT LEAST THREE SIDES
REGULAR POLYGON A POLYGON IN WHICH ALL OF THE SIDES AND ANGLES ARE CONGRUENT
POLYGON - SUM OF ANGLES = (NUMBER OF SIDES - 2)*180
(n-2)*180 SUM OF POLYGON ANGLES
AREA OF GEOMETRIC FIGURE THE NUMBER OF SQARE UNITS NEEDED TO COVER THE FIGURE
PERIMETER THE DISTANCE AROUND A POLYGON
AREA OF A TRIANGLE 1/2 base * height (1/2bh)
AREA OF A PARALLELOGRAM base * height (bh)
AREA OF A TRAPEZOID 1/2h(b1 + b2)
Created by: hgerlach