Beat the Computer

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Beat the Computer!
Geometry Vocabulary and Formulas for Unit 1
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• Directions
• A slide will appear with a term
• Say the definition aloud before the computer can
  answer (5 sec.)
• You will hear a sound when the slide changes

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inductive reasoning
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inductive reasoning reasoning based on patterns
you observe
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conjecture
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conjecture a conclusion reached when using
inductive reasoning
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counterexample
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counterexample an example for which a conjecture
is false
Conjecture All integers are natural
numbers. Counterexample -1
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point
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point a location in space having no size
P
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space
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space the set of all points
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line
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line a series of points that extends in two
opposite directions without end
t
P
Q
line t or
or
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collinear points
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collinear points points that lie on the same line
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plane
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plane a flat surface that has no thickness
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coplanar
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coplanar points and lines that lie in the same
plane
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postulate or axiom
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postulate or axiom a statement that is accepted
as true without proof
Example Through any two points there is exactly
one line.
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segment
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segment the part of a line consisting of two
endpoints and all the points between them
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ray
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ray the part of a line consisting of two
endpoints and all the points between them
Ray YX
Y
X
endpoint
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opposite rays
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opposite rays two collinear rays with the same
endpoint
X
S
R
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parallel lines
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parallel lines coplanar lines that do not
intersect
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skew lines
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skew lines lines that do not lie in the same
plane
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parallel planes
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parallel planes planes that do not intersect
Plane ABCD is parallel to Plane EFGH
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congruent (?) segments
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congruent segments segments with the same length
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midpoint of a segment
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midpoint of a segment a point that divides a
segment into two congruent segments
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angle
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angle two rays with the same endpoint
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acute angle
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acute angle an angle whose measure is between 0º
and 90º
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right angle
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right angle an angle whose measure is exactly 90º
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obtuse angle
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obtuse angle an angle whose measure is between
90º and 180º
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straight angle
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straight angle an angle whose measure is exactly
180º
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congruent angles
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congruent angles angles with the same measure
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perpendicular lines
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perpendicular lines two lines that intersect to
form right angles
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perpendicular bisector of a segment
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perpendicular bisector of a segment a line,
segment, or ray that is ? to the segment at its
midpoint, thereby bisecting the segment into two
? segments
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angle bisector
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angle bisector a ray that divides an angle into
two congruent coplanar angles
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distance formula
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distance formula the distance d between two
points A(x1,x2) and B(y1,y2)
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midpoint formula
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midpoint formula the coordinates of the midpoint
M of AB with endpoints A(x1,x2) and B(y1,y2) are