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10th geometry - 1.2, 1.3, 1.4, 1.5
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Gravity
Key Concepts:
Terms in this set (35)
equidistant
equally distant, same distance
point
represented by a dot, named by a capital letter, no size or dimension
line
always means a straight line, may be named by a single lowercase letter or two capital letters
plane
has two dimensions (length and width) unending, denoted by a capital letter or letters on edges
space
the set of all points
collinear points
points all in one line
noncollinear points
points not in one line
coplanar points
points all in one plane
noncoplanar points
points not in one plane
intersection
to meet or to cut
segment
consists of all the endpoints and the points between them
number line
every point is paired with a number and every number is paired with a point
length
the distance between points
ruler postulate
distance equals absolute value of difference of coordinates
segment addition postulate
if B is between A&C then AB + BC = AC
congruent
have the same shape and size
midpoint of a segment
point that divides the segment into two equal segments
bisector of a segment
a segment, ray, or line or plane that intersects the segment at its midpoint
angle
figure formed by two rays that have the same endpoint
acute angle
measure between 0˚ and 90˚
right angle
measure of 90˚
obtuse angle
measure between 90˚ and 180˚
straight angle
measure of 180˚
protractor postulate
absolute value of the difference of the angles
angle addition postulate
if B lies on the interior of <AOC then <AOB + <BOC = <AOC
adjacent angles
two angles in a plane that have a common vertex and a common side but no common interior points
bisector of an angle
ray that divides the angle into two equal angles
p 5
a line contains at least two points; a plane contains at least three noncollinear points; space contains at least four noncoplanar points
p 6
through any two points there is exactly one line
p 7
through any three points there is at least one plane; through any three noncollinear points there is exactly one plane
p 8
if two points are in a plane then the line that contains the points is in that plane
p 9
if two planes intersect then their intersection is a line
t 1.1
if two lines intersect then they intersect in exactly one point
t 1.2
through a line and a point not in the line there is exactly one plane
t 1.3
if two lines intersect then exactly one plane contains the lines
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