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