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73 Cards in this Set
 Front
 Back
two angles that share a common vertex and a common side between them

adjacent angles


a quadrilateral with two pairs of parallel sides

parallelogram


a triangle with the degree bigger than 90 degrees

obtuse


a parallelogram with four right angles

rectangle


a triangle in which all angles are equal.

equiangular


if line segment of any two interior points is completely inside figure

convex


region inside an angle

interior


in a regular ngon, any angle with vertex at the center of a regular polygon and sides containing adjacent vertices of the polygon

central angle


the union of two rays that have a common endpoint

angle


a diameter divides a circle into two parts

semicircles


has 8 sides

octagon


a triangle with a 90 degree angle

right


the sum of the measures of two angles is 180 degrees

supplementary angles


two lines that intersect to form right angles

perpendicular lines


an angle whose measure is 90 degrees

right angle


an angle whose measure is betwwen 90 and 180 degrees

obtuse


two lines that meet intersecting planes form a straight line

intersecting lines


has six sides

hexagon


a triangle in which at least two sides are equal

isosceles


a triangle in which all sides are equal

equilateral


has an endpoint and is extended indefinetly in one direction

ray


a chord that passes throught the center

diameter


a triangle with no sides equal

scalene


has four sides

quadrilateral


In a regular ngon:
each interior angle has a measure (n2)x180/n. each exterior angle has measure 360/n each central angle has measure 360/n 
theorem: angle measure in a regular ngon


a tool used to measure angles

protractor


can be drawn without lifting a pencil and without passing through any point twice

simple curve


the exterior and the interior of a simple closed curve

regions


the rays forming an angle

sides


a quadrilateral with two distinct pairs of congruent adjacent sides

kite


point M is between points A and B such that M is the same distance from A and B

midpoint


a set of points that a pencil can trace without lifting until all points are covered

curve


a quadrilateral with exactly one pair of parallel sides

trapezoid


the sum of the measures of the interior angles of any ngon is (n2) 180 degrees

theorem: sum of the interior angle measures of a general polygon


refers to a line that intersects (touches) the circle in only one point

tangent


a dot
Always with capital letter A, B,C 
point


formed by the intersection of two flat surfaces and extends indefinitely in both directions a line can be divided into three parts: point, and twohalf lines

line


part of a line, has two end points

line segment


distance of a line segement

length


similar to a piece of pie

sector


has 10 sides

decagon


points that lie on the same line

collinear points


two angles such that the sides of one angle forms the sides of the other angle.
Only share a common vertex. Have equal measures. 
vertical angles


A simple closed plane curve seperates the plane into three disjoint subsets: the curve itself, the interior, and the exterior

Jordan curve theorem


an angle whose measure is 180 degrees

straight angle


region outside an angle

exterior


consists of two endpoints and all points on the circle between these endpoints

arc


has seven sides

heptagon


has the same starting and ending point and drawn without lifting a pencil

closed curve


refers to a line that intersects the circle in two pints

secant line


two segments have the same length

congruent


the set of points in a plane, each of which is the same distance from a fixed point the fixed point lies in the interior and is called the center

circle


has three sides

triangle


1)the sun of the measures of the exterior angles of a convex polygon is 360 degrees
2) the sum of the measures of the interior angles of a conves ngon is (n2) 180 degrees 
theorem: sums of the angle measures in a convex polygon


an angle whose measure is between 0 and 90 degrees

acute


two or more planes that never meet

parallel planes


a parallelogram with all sides having equal length

rhombus


segments whose endpoints both lie on the circle

chords


a rectangle with all sides having equal length

square


a polygon with all sides equal and all angles equal

regular polygon


a figure that is not convex

concave


a flat surface

plane


three lines intersect in one point

concurrent ~
= 

an angle with the measure greater than 180 but less than 360 degrees

reflex


two or more lines that lie in the same plane and never meet

parallel lines


simple closed curve made up of only straight line segments are called sides.

polygon


is defined to be 1/360 of a complete rotation

one degree


the common endpoint of an angle

vertex


a triangle that is less than 90 degrees

acute


the sum of the measures of two angles is 90 degrees

complementary angles


two angles that have the same measure

congruent angles


has 9 sides

nonagon


has five sides

pentagon
