# Eisenberg Vocabulary

### 90 terms by ktlovesbks

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includes points, lines, rays, angles, polygons, triangles, quadrilaterals, circles

### point

has no size, only location

### line

straight, continous arrangement of infinitely many points; has no thickness; one-dimensional

### plane

flat surface; two-dimensional; surface extends indinitely along its length and width; a plane is named with script capital letter

### collinear

points that lie along the same line

### coplainar

points that lie within the same plane

### line segment

consists of two points called the endpoints of the segment and all the points between them that are collinear with the two points

### congruent segments

segments that are equal in measure or length

### midpoint

the point on the segment that is the same distance from both endpoints. A pair of hatch marks refer to line segments being the same length

to cut in half

### ray

begins at a point and extends infinitely in one direction

### angle

formed by two rays that share a common endpoint

### vertex

the common endpoint of the two rays of the angle

### sides

the rays of an angle

### measure of an angle

the smallest amount of rotation about the vertex from one ray to the other

### degrees

unit of measurement for an angle

### protractor

a geometry tool used to measure angles

### congruent angles-

angles that are equal in measure

### angle bisector

a ray that divides the angle into two congruent angles

### parallel lines

lines that do not intersect and are part of the same plane

### perpendicular lines

lines that do intersect and form a right angle

### skew lines

lines that are neither parallel nor do they intersect (for 3-D setting)

### right angle

an angle that measures 90 degrees

### acute angle

an angle that measures less than 90 degrees

### obtuse angle

an angle that measures more that 90 degrees

### pair of vertical angles

angles that are formed by two intersecting lines; they share a common vertex but not a common side

### linear pair of angles

two angles are a ____if they share a vertex and a common side and their non-common sides form a line

### complementary angles

angles that form a right angle

### supplementary angles

angles that sum up to 180 degrees

### polygon

closed figure in a plane, formed by connecting line segments endpoint to endpoint with each segment intersecting the other

### consecutive vertices

vertices that are adjacent to one another

### consecutive angles

angles that are adjacent to one another

### diangonal

a line segment that connects any two nonconsecutive vertices

### concave polygon

a polygon that has at least one diagonal on the outside

### convex polygon

a polygon that has no diagonals on the outside

### congruent polygons

polygons that have exactly the same size and shape

### equilateral polygons

a polygon who's sides are all equal

### equilangular polygon

a polygon whose angles are all equal

### regular polygon

a polygon whose sides and angles are all equal

3 sides

4 sides

5 sides

6 sides

7 sides

8 sides

9 sides

10 sides

11 sides

12 sides

13 sides

14 sides

15 sides

16 sides

17 sides

18 sides

19 sides

20 sides

21 sides

30 sides

100 sides

### chiliagon

1000 sides (chilagon?)

10000 sides

### acute triangle

all angles are less than 90 degrees

### obtuse triangle

one angle is more than 90 degrees and less than 180 degrees of a three sided polygon

### right triangle

one angle is exactly 90 degrees

### scalene triangle

no two sides are congruent of a three sided polygon

### isosceles triangle

at least two sides are congruent of a three sided polygon

### equilateral triangle

all sides are congruent of a three sided polygon

### trapazoid

a quadrilateral with exactly one pair of parallel sides

### isosceles trapazoid

top and bottom are parallel, two sides are congruent, top two angles are congruent, bottom two angles are congruent

two right angles

### kite

a quadrilateral with two pairs of consecutive congruent sides. The diagonails are perpendicular

### parallelogram

a quadrilateral with two pairs of parallel sides

### rhombus

an equilateral parallelogram

### rectangle

a parallelogram with four congruent angles (right angles); an equilateral parallelogram

### square

an equilateral, equilangular parallelogram; a regular quadrilateral; an equalateral rectangle

### circle

a set of all points in a plane that are the same distance from a given point (center) in a plane

a line segment from the center point of a circle to a point on the edge of a circle

### diameter

a line segment passing through the center point of a circle and whose endpoints are on the edge of the circle

### chord

any line segment whose endpoints are on the edge of a circle; the diameter is the longest chord

### congruent circles

circles that have the same radius length

### concentric circles

circles that share the same center point

### arc of a circle

the continuous (unbroken) part of a circle that is in between two points on the edge of a circle

### semicircle

arc of a circle whose endpoints are the endpoints of the diameter

### minor arc

an arc of a circle that is smaller than a semicircle

### major arc

an arc of a circle that is larger than a semicircle

### arc measure

the measure of the central angle (in degrees)

### central angle

angle formed by two radii and whose vertex is the center point of a circle

### tangent

a line that intersects the circle at exactly one point

### secant

a line that intersects the circle at exactly two points

### inscribe angle

angle whose vertex is the point on a circle; the sides of this angle are the chords of the circle

Example: