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Math Vocab Unit 1

Geometry vocab

point has no size, all geometric figures are made.
Line series of points that extends in opposite directions without end.
Plane a flat surface with no thickness
Space the set of all points
Rays part of a line with one endpoint
Segment part of a line with two end points
Opposite Rays two collinear rays with a common endpoint
Acute angle angle less than 90'
Obtuse angle angle more than 90'
Straight Angle angle 180'
Collinear points on the same line
coplanar points and lines in the same plane. 3
Deductive reasoning use facts, definitions, rules or properties to reach a conclusion
conjecture a conclusion reached using inductive reasoning
parallel lines coplanar lines that never intersect
skew lines non-planar lines that never intersect
angle formed by two rays with same endpoint
right angle equals 90'
vertical angles non adjacent angled formed by two intersecting lines
linear pair angles are adjacent whose non common sides are opposite rays
adjacent angles angles in the same plane that have a common vertex and a common side, but no common interior points
supplementary angles two angles of the sum of the degrees = 180'
complementay angles two angles sum = 90'
theorem a statement that must be proven before it is accepted as true
corollary an inference, follows little to no proof
postulate true statement, which doesn't need to be proven
counterexample makes a conjecture false
segment addition postulate AB+BC=AC
angle addition postulate m
congruent angles have the same degree measure
congruent segements have the same length
Pythagorean Theorem c"=a"+b"
perpendicular lines form 4 right angles
distnace formula d= (x"-x')" + (y"-y')"
midpoint a+b/2
midpoint formula x'+x"/2 , y'+y"/2
angle bisector a ray that divides an angle into two congruent angles
hypotenuse c
legs of a right triangle a and b
perpendicular bisector line in perpendicular
inductive reasoning educated guess
Created by: hammy57