1. GEOMETRY UNIT 1 VOCABULARY

2. CONGRUENT SAME SIZE, SAME SHAPE

3. SIMILAR SAME SHAPE, DIFFERENT SIZE

4. LINE SYMMETRY A LINE THROUGH A FIGURE THAT MAKES EACH SIDE A MIRROR IMAGE OF THE OTHER SIDE

5. ROTATIONAL SYMMETRY A FIGURE CAN BE TURNED 180 DEGREES OR LESS AND STILL LOOKS THE SAME

6. MIDPOINT A POINT ON THE MIDDLE OF A LINE SEGMENT (IT’S AN AVERAGE OF THE TWO ENDPOINTS )

7. SLOPE RISE OVER RUN (SUBTRACT THE Y’S, THEN SUBTRACT THE X’S)

8. PARALLEL LINES THAT NEVER INTERSECT AND HAVE THE SAME SLOPE

9. PERPENDICULAR LINES THAT INTERSECT TO FORM RIGHT ANGLES; THEIR SLOPES ARE NEGATIVE RECIPROCALS

10. POINT JUST A DOT; NAMED WITH A SINGLE CAPITAL LETTER

11. LINE MADE UP OF MANY POINTS; GOES ON FOREVER

12. PLANE A FLAT SURFACE; HAS LENGTH AND WIDTH

13. LINE SEGMENT A PART OF A LINE, WITH 2 ENDPOINTS

14. PERIMETER THE SUM OF THE LENGTHS OF ALL THE SIDES OF A FIGURE

15. AREA DIVIDING A LINE SEGMENT, ANGLE OR FIGURE INTO 2 CONGRUENT PARTS

16. BISECTING DIVIDING A LINE SEGMENT, ANGLE OR FIGURE INTO 2 CONGRUENT PARTS