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Ch. 9 Vocabulary

Pre-Algebra - Ch. 9

Point a location in space that has no size
line a series of points that extends in opposite directions without end
Plane a flat surface with no thickness and extends without end in all directions
Line segment a part of a line that has two endpoints
ray a part of a line that has exactly one endpoint and extends without end in one direction
parallel lines two lines that lie in the same plane and do not intersect
skew lines lines that do not lie in the same plane, are not parallel and do not intersect
Adjacent angles angles that share a vertex and a side but no points in their interiors
vertical angles angles that are formed by two intersecting lines and are opposite each other.
Congruent angles angles that have the same measure
Supplementary angles angles whose sum is 180 degrees
Complementary angles angles whose sum is 90 degrees
Transversal a lines that intersects two other lines in different points
Corresponding angles lie on the same side of the transversal in corresponding positions
alternate interior angles angles in the interior of a pair of lines and on opposite sides of the transversal
polygon a closed plane figure with at least three sides
acute triangle triangle with three acute angles
right triangle triangle with one right angle
obtuse triangle triangle with one obtuse angle
equilateral triangle triangle with three congruent sides
isosceles triangle triangle with at least two congruent sides
scalene triangle triangle with no congruent sides
quadrilateral polygon with 4 sides
trapezoid a quadrilateral with exactly one pair of parallel sides
parallelogram quadrilateral with both pairs of opposite sides parallel
rectangle a parallelogram with four 90 degree angles
square a rectangle with four congruent sides
rhombus a parallelogram with four congruent sides
regular polygon a polygon where all sides and angles are congruent
circle the set of all points in a plane that are the same distance from a given point
central angle an angle whose vertex is the center of a circle
radius a segment that has one endpoint at the center and the other endpoint on the circle
diameter a chord that passes through the center of a circle
circumference distance around a circle
chord a segment whose endpoints are on the circle
congruent figures figures that have the same shape and size, and their corresponding parts have equal measures
congruent angles Angles that have the same measure
Acute angle An angle with a measure less than 90 degrees
angle of rotation the angle measure of the rotation
center of rotation the fixed point which a figure rotates around
decagon a figure with 10 sides
diagonal a segment that connects two nonconsecutive vertices
heptagon a seven sided figure
hexagon a six sided figure
image the result of the transformation of a point, line, or figure to a new set of coordinates
line of reflection a line across which a figure is reflected
line of symmetry a line that divides a figure with rotational symmetry into 2 congruent halves
nonagon a nine sided figure
obtuse angle an angle with a measure of more than 90 degrees but less than 180 degrees
octagon an eight sided figure
pentagon a five sided figure
perpendicular lines lines that intersect and from a 90 degree angle
reflection a transformation that flips a figure over a line of reflection
reflectional symmetry when one half of a figure is a mirror image of the other half
right angle an angle that measures 90 degrees
rotation a transformation that turns a figure about a fixed point
rotational symmetry when the figure can be rotated 180 degrees or less and match the original figure
straight angle an angle with a measure of 180 degrees
transformation a change of position or size of a figure
translation a transformation that moves points the same distance and in the same direction
triangle a three sided figure
Created by: unverferth