## Geometry Vocabulary

##### Created by:

Lizard-Boy  on February 9, 2011

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# Geometry Vocabulary

 pointan exact location in space
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#### Definitions

point an exact location in space
line a never ending straight path of points extending in both directions
plane a two-dimensional flat surface that extends in all directions without end
line segment part of a line with two endpoints
ray a part of a line with one endpoint
angle two rays that have a common endpoint
vertex the common endpoint of an angle
protractor tool used to measure angles
degrees the most common measurement for angles
acute angle angle measuring between 0 degrees and 90 degrees
right angle angle measuring exactly 90 degrees
obtuse angle an angle measuring between 90 degrees and 180 degrees
straight angle an angle measuring exactly 180 degrees
parallel two lines in a plane that never intersect
perpendicular lines that intersect to form a right angle
skew lines that are neither intersecting nor parallel - skew lines lie in different planes
vertical angles two pairs of opposite angles formed by intersecting lines - vertical angles are congruent
adjacent angles two angles with a common side, a common vertex, and do not overlap
congruent the same
complementary angles angles that sum to 90 degrees
supplementary angles angles that sum to 180
transversal a line that intersects two parallel lines to form eight angles
alternate interior angles angles on opposite sides of the transversal and inside the parallel lines -alternate interior angles are congruent
alternate exterior angles angles on opposite sides of the transversal and outside the parallel lines -alternate exterior angles are congruent
corresponding angles angles in the same position on the parallel lines in relation to the transversal - corresponding angles are congruent
acute triangle a triangle with all acute angles
right triangle a triangle with one right angle
obtuse triangle a triangle with one obtuse angle
equilateral triangle a triangle with all sides and angles congruent
isoscelese triangle a triangle with two sides and two angles congruent
scalene triangle a triangle with no sides or angles congruent
translation slide a figure from one position to another position
reflection flip a figure over a line
rotation turn a figure around a fixed point
similar polygons that have the same shape but not necessarily the same size
quadrilateral 4 sided polygon
parallelogram quadrilateral with opposite sides parallel and congruent
trapezoid quadrilateral with one pair of parallel sides
rectangle parallelogram with 4 right angles
square parallelogram with 4 right angles and 4 congruent sides
rhombus parallelogram with 4 congruent sides
polygon a simple, closed figure formed by three or more line segments
regular polygon a polygon with all angles and sides congruent
circle the set of all points in a plane that are the same distance from a given point
radius the distance from the center to any point on the circle
diameter the distance across the circle through its center
symmetry each half of a figure is a mirror image of the other half when a line is drawn
area the measure of the surface enclosed by a geometric figure
perimeter the distance around a polygon
circumference the distance around a circle

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