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# GEOMETRY GT VOCAB

### KNOW THESE WORDS

ANGLE BISECTOR A RAY THAT DIVIDES AN ANGLE INTO TWO ANGLES THAT ARE CONGRUENT
ANGLE OF ELEVATION WHEN YOU LOOK UP AT AN OBJECT, THE ANGLE THAT YOUR LINE OF SIGHT MAKES WITH A LINE DRAWN HORIZONTALLY
BASE ANGLES OF AN ISOSCELES TRIANGLE THE TWO ANGLES THAT ARE ADJACENT TO THE BASE OF AN ISOSCELES TRIANGLES
EQUIANGULAR ALL INTERIOR ANGLES CONGRUENT
EQUILATERAL POLYGON A POLYGON WITH ALL OF ITS SIDES CONGRUENT
EXTERIOR ANGLES OF A TRIANGLE WHEN THE SIDES OF A TRIANGLE ARE EXTENDED, THE ANGLES THAT ARE ADJACENT TO THE INTERIOR ANGLES
COLLINEAR POINTS POINTS THAT LIE ON THE SAME LINE
COMPLEMETARY ANGLES 2 ANGLES WHOSE MEASURES HAVE THE SUM OF 90 DEGREES
HEXAGON A POLYGON WITH 6 SIDES
CONGRUENT ANGLES ANGLES THAT HAVE THE SAME MEASURE
CONGRUENT FIGURES 2 GEOMETRIC FIGURES THAT HAVE EXACTLY THE SAME SIZE AND SHAPE.
CONSECUTIVE INTERIOR ANGLES 2 ANGLES THAT ARE FORMED BY 2 LINES AND A TRANSVERSAL AND LIE BETWEEN THE 2 LINES AND ON THE SAME SIDE
COPLANAR POINTS POINTS THAT LIE IN THE SAME PLANE
HYPOTENUSE IN A RIGHT TRIANGLE, THE SIDE OPPOSITE THE RIGHT ANGLE
DECAGON A POLYGON WITH 10 SIDES
DILATION A TRANSFORMATION THAT STRETCHES OR SHRINKS A FIGURES TO CREATE A SIMILAR FIGURE
DODECAGON A POLYGON WITH 12 SIDES
ISOSCELES TRIANGLE A TRIANGLE WITH AT LEAST 2 CONGRUENT SIDES
LINE SEGMENT PART OF A LINE THAT CONSISTS OF 2 POINTS CALLED ENDPOINTS
MIDPOINT A POINT THAT DIVIDES,BISECTS, A SEGMENT INTO 2 CONGRUENT SEGMENTS
N-GON A POLYGON WITH N SIDES
OBTUSE ANGLE AN ANGLE WHOSE MEASURE IS BETWEEN 90 AND 180 DEGREES
OCTAGON A POLYGON WITH 8 SIDES
PARALLEL LINES TWO LINES THAT DO NOT INTERSECT
PARALLELOGRAM A QUADRILATERAL WITH BOTH PAIRS OF OPPOSITE SIDES ARE PARALLEL
PENTAGON A POLYGON WITH 5 SIDSES
PERPENDICULAR BISECTOR A SEGMENT,RAY,LINE, OR PLANE THAT IS PERPENDICULAR TO A SEGMENT AT ITS MIDPOINT
PERPENDICULAR LINES TWO LINES THAT INTERSECT TO FORM A RIGHT ANGLE
PREIMAGE THE ORIGINAL FIGURE IN A TRANSFORMATION
PROOF A LOGICAL ARGUMENT THAT SHOWS A STATEMENT IS TRUE
QUADRILATERAL A POLYGON WITH 4 SIDES
RAY PART OF A LINE THAT CONSISTS OF A POINT CALLED AN ENDPOINT AND ALL POINTS ON THE LINE EXTEND IN ONE DIRECTION
RECTANGLE A PARALLELOGRAM WITH 4 RIGHT ANGLES
REDUCTION A DILATION WITH A SCALE FACTOR BETWEEN 0 AND 1
REFLECTION A TRANSFORMATION THAT USES A LINE OF REFLECTION TO CREATE A MIRROR IMAGE OF THE ORIGINAL FIGURE
REGULAR POLYGON A POLYGON THAT HAS ALL SIDES AND ALL ANGLES CONGRUENT
RHOMBUS A PARALLELOGRAM WITH 4 CONGRUENT SIDES
RIGHT ANGLES AN ANGLE WITH MEASURE EQUAL TO 90 DEGREES
ROTATION A TRANSFORMATION IN WHICH A FIGURE IS TURNED ABOUT A FIXED POINT CALLED THE CENTER OF ROTATION
ROTATIONAL SYMMETRY A FIGURE CAN BE MAPPED ONTO ITSELF BY A ROTATION OF 180 DEGREES OR LESS ABOUT THE CENTER OF THE FIGURE
SCALE FACTOR OF A DILATION THE RATIO OF A SIDE LENGTH OF THE IMAGE TO THE CORRESPONDING SIDE LENGTH OF THE ORIGINAL FIGURE
SEGMENT BISECTOR A POINT,RAY, LINE, SEGMENT, OR PLANE THAT INTERSECTS A SEGMENT AT ITS MIDPOINT
SIMILAR POLYGONS TWO POLYGONS SUCH THAT THEIR CORRESPONDING SIDES ARE PROPORTIONAL AND THEIR CORRESPONDING ANGLES ARE CONGRUENT
SINE OPPOSITE/HYPOTENUSE