Section 1
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Last updated
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Date created
Mar 1, 2020
Cards (53)
Section 1
(50 cards)
regular polygon
convex, equilateral, and equiangular
coplanar
points that lie in the same plane
angle bisector
a ray that divides an angle into two congruent angles
degree
1/360 of a circle, used to measure angles
congruent angles
angles with exactly the same measure
plane
flat surface that extends without end in all directions and has no thickness, named with three non-collinear points
equiangular
all angles are congruent
postulate
an accepted truth, also called an axiom, canNOT be formally proven
right angle
an angle whose measure is exactly 90 degrees, indicated with a "box" in the corner
collinear
points that lie in the same line
undefined terms
points, lines, and planes are __________ because they cannot be made from any other figures, they are the "building blocks of geometry"
10 sided polygon
decagon
7 sided polygon
heptagon
acute angle
an angle whose measure is between 0 and 90 degrees
complementary angles
angles whose measures have a SUM of 90 degrees, they may or may not be adjacent
3 sided polygon
triangle
perpendicular lines
two lines that intersect to form a right angle
supplementary angles
angles whose measures have a SUM of 180 degrees, they may or may not be adjacent
perpendicular bisector
a line, segment, or ray that is perpendicular to a segment at its midpoint
distance formula
comes from the Pythagorean theorem
9 sided polygon
nonagon
distance
how far apart two points are, also called the length, if on a number line it is the absolute value of the difference of the coordinates
12 sided polygon
dodecagon
bisect
to cut into two congruent pieces
6 sided polygon
hexagon
ray
part of a line that consists of one endpoint and all the points of the line on one side of the endpoint
vertical angles
angles across from each other on intersecting lines, they are always congruent
linear pair
a pair of adjacent AND supplementary angles
congruent segments
segments that have the same length
adjacent angles
angles (in the same place) that share a common ray and a common vertex
5 sided polygon
pentagon
line
straight path that extends in opposite directions, never ends, has no thickness nor width, contains infinitely many points
4 sided polygon
quadrilateral
intersection
the point or set of points that figures have in common
midpoint formula
find the average of the x values and the average of the y values
obtuse angle
an angle whose measure is between 90 and 180 degrees
segment addition postulate
if three points A, B, and C are collinear and B is between A and C, then AB + BC = AC, "part + part = whole"
angle addition postulate
if point B is on the interior of angle AOC, then the m<AOB + m<BOC = m<AOC, "part + part = whole"
equilateral
all sides are congruent
vertex
the common endpoint of two rays, always the middle letter when naming angles with three points
opposite rays
two rays that share a common endpoint and form a line
angle
two rays with a common endpoint
point
indicates a location and has no shape or size
non-adjacent angles
angles that do not share a common ray
8 sided polygon
octagon
straight angle
an angle whose measure is exactly 180 degrees
polygon
many sided figure
segment
a measurable part of a line that consists of two endpoints and all the points between them
midpoint
a point that divides a segment into two congruent halves
segment bisector
a line, ray, or other segment that intersects a segment at its midpoint
Section 2
(3 cards)