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


has no size, only location


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


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


points that lie along the same line


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


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


begins at a point and extends infinitely in one direction


formed by two rays that share a common endpoint


the common endpoint of the two rays of the angle


the rays of an angle

measure of an angle

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


unit of measurement for an angle


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


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


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


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


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

right trapazoid

two right angles


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


a quadrilateral with two pairs of parallel sides


an equilateral parallelogram


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


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


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


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


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


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


a line that intersects the circle at exactly one point


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

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