Download 8th grade Math Vocabulary Unit 3

Unit 3
8th grade Vocabulary
Word, Definition, model
Adjacent Angles
DEFINITION: ADJOINING OR
SHARING ONE SIDE.
MODEL:
Alternate Interior Angles
DEFINITION: ANGLES ON THE
OPPOSITE SIDE OF THE
TRANSVERSAL BUT BETWEEN THE
PARALLEL LINES.
MODEL:
Angle-Angle Criterion
DEFINITION: IF TWO CONSECUTIVE ANGLES ARE
CONGRUENT TO TWO CONSECUTIVE ANGLES OF
ANOTHER TRIANGLE, THEN THE TRIANGLES ARE
SIMILAR. THE THIRD ANGLE IS THE SAME IN
BOTH TRIANGLES BECAUSE THE SUM OF ALL THE
ANGLES IS EQUAL TO 180.
MODEL:
Deductive Reasoning
DEFINITION: WHEN SOMEONE
COMBINES KNOWN INFORMATION,
FACTS, RULES OR PROPERTIES TO
DRAW A CONCLUSION.
MODEL: ALL ORANGES
ARE FRUITS, ALL FRUITS
GROW ON TREES
THEREFORE, ALL
ORANGES GROW ON
TREES
Vertical Angles
DEFINITION: TWO ANGLES THAT
ARE ACROSS THE INTERSECTION
OF THE LINES THAT CREATE THEM.
MODEL:
Center of Rotation
DEFINITION: THE FIXED POINT
ABOUT WHICH A FIGURE IS
ROTATED.
MODEL:
Clockwise
DEFINITION: FROM THE TOP,
DOWN AND TO THE RIGHT.
MODEL:
Counterclockwise
DEFINITION: WHEN A FIGURE MOVES
FROM A POINT, TO THE LEFT AND
DOWN AS IN THE OPPOSITE OF THE
HANDS OF A CLOCK.
MODEL:
Congruence
DEFINITION: FIGURES THAT HAVE
THE SAME SIZE AND SHAPE.
MODEL:
Dilations
DEFINITION: TO TRANSFORM A
FIGURE BY CHANGING ITS SIZE
SHRINKING OR STRETCHING ITS
DIMENSIONS. SHAPE WILL NOT
CHANGE.
MODEL:
Image
DEFINITION: A FIGURE AFTER IT
HAS BEEN TRANSFORMED. THE
FINAL FIGURE.
MODEL:
Interior Angles
DEFINITION: AN ANGLE THAT IS
WITHIN A FIGURE OR BETWEEN
PARALLEL LINES.
MODEL:
Line of Reflection
DEFINITION: THE LINE OVER
WHICH A FIGURE IS FLIPPED. ALL
POINTS ARE EQUIDISTANT (AND
OPPOSITE) FROM THIS LINE.
MODEL:
Parallel Lines
DEFINITION: LINES THAT ARE
ALWAYS THE SAME DISTANCE
APART.
MODEL:
Pre-image
DEFINITION: THE INITIAL IMAGE
BEFORE A FIGURE IS
TRANSFORMED IN SOME WAY.
MODEL:
Reading A’ as A prime
DEFINITION: IF A IS THE INITIAL
SET THEN A' (READ A PRIME) IS
THE SET AFTER AN APPLIED
CHANGE.
MODEL:
Similarity
DEFINITION: WHEN POLYGONS HAVE
THE SAME SHAPE; CORRESPONDING
ANGLES ARE EQUAL BUT SIDES ARE
PROPORTIONAL. (SAME SHAPE,
DIFFERENT SIZE)
MODEL:
Reflections
DEFINITION: A FIGURE OR LINE
DESIGN HAS REFLECTION SYMMETRY
IF YOU CAN DIVIDE THE DESIGN INTO
HALVES THAT ARE MIRROR IMAGES.
MODEL:
Rigid Transformations
DEFINITION: TRANSFORMATIONS
OF A FIGURE THAT DO NOT
CHANGE ITS SHAPE OR SIZE.
MODEL:
Exterior Angles
DEFINITION: THE ANGLE FORMED
WHEN ONE SIDE IS EXTENDED
BEYOND ITS ADJACENT SIDES.
MODEL:
Rotations
DEFINITION: TO TURN A FIGURE A
SPECIFIED NUMBER OF DEGREES
WHILE HOLDING ONE POINT FIXED
OR CONSTANT. THIS FIGURE DOES
NOT CHANGE SIZE OR SHAPE.
MODEL:
Scale factor
DEFINITION: THE CONSTANT THAT
INCREASES ALL VALUES OF A
FIGURE IN A PATTERN.
MODEL:
Supplementary
DEFINITION: TWO ANGLES ARE
THIS IF THE SUM OF THEIR
MEASURES IS 180 DEGREES.
MODEL:
Complementary
DEFINITION: ANGLES WHOSE
MEASURES ADD TO 90 DEGREES.
MODEL:
Corresponding
DEFINITION: ANGLES THAT OCCUPY
THE SAME RELATIVE POSITION AT
EACH INTERSECTION WHERE A
STRAIGHT LINE CROSSES TWO
OTHERS.
MODEL:
Translations
DEFINITION: TO SLIDE A FIGURE
ALONG A STRAIGHT-LINE
WITHOUT CHANGING SIZE OR
SHAPE.
MODEL:
Transversals
DEFINITION: A LINE THAT CROSSES
OTHER LINES. IT MAKES ANGLES
THAT CAN BE USED TO
DETERMINE OTHER ANGLES.
MODEL:
8th grade
Vocabulary
1. Adjacent
10. Dilations
2. Alternate interior 11. Image
Angles
12. Interior angles
3. Angle-angle
13. Line of reflection
criterion
14. Parallel lines
4. Deductive
15. Pre-Image
Reasoning
16. Reading A’ as A
5. Vertical angles
prime
6. Center of rotation 17. Similarity
7. Clockwise
18. Reflections
8. Counterclockwise 19. Rigid
9. Congruence
Transformations
20.
21.
22.
23.
24.
25.
26.
27.
Exterior angles
Rotations
Scale factor
Supplementary
Complementary
Corresponding
Translations
Transversals