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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 n-gon, 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 n-gon:
each interior angle has a measure (n-2)x180/n.
each exterior angle has measure 360/n
each central angle has measure 360/n
theorem: angle measure in a regular n-gon
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 n-gon is (n-2) 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 two-half 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 n-gon is (n-2) 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