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32 Cards in this Set
- Front
- Back
point |
has no dimension, it is represented by a dot |
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line |
has one dimension, it is represented by a line with two arrowheads, but it extends without end |
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plane |
has two dimensions, it is represented by a shape that looks like a floor or a wall, but it extends without end |
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intersection |
a set of points that two common figures have in common |
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postulate/axiom |
a rule or belief that is accepted without proof |
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coordinate |
the real number that corresponds to a point |
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distance |
the absolute value of the difference of coordinates of A and B |
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segment addition postulate |
if B is between A and C, the AB plus BC is equal to AC |
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congruent segments |
line segments that have the same length |
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collinear points |
points that lie on the same line |
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coplanar points |
points that lie on the same plane |
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ruler postulate |
the points on a line can be matched one-to-one with the real numbers |
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midpoint |
the point that divides the segment into two congruent segments |
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segment bisector |
a point, ray, line, line segment, or plane that intersects the segment at its midpoint |
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angle |
two different rays with the same endpoint 1. acute = 1-89 degrees 2. obtuse = 91-179 degrees 3. straight = 180 degrees 4. right = 90 degrees |
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congruent angles |
angles that have the same measure |
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angle bisector |
ray that divides an angle into two angles that are congruent |
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protractor postulate |
Consider ray OB and a point A on one side of OB. The rays of the form OA can be matched one-to-one with the real numbers from 0 to 180. |
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complementary angles |
sum of their measures is 90 degrees
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supplementary angles |
sum of their measures is 180 degrees |
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adjacent angles |
two angles that share a common vertex and side, but no common interior points |
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linear pair |
two adjacent angles where their noncommon sides are opposite rays |
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vertical angles |
two angles where their sides form two pairs of opposite rays |
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polygon |
a closed plane figure formed by three or more sides and no two sides with a common endpoint are collinear |
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vertex |
each endpoint of a side of a polygon |
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convex polygon |
no line that contains a side of the polygon contains a point in the interior of the polygon |
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concave polygon |
a nonconvex polygon |
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n-gon |
where n is the number of a polygon's sides, can also be used to name a polygon |
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equilateral |
all sides are congruent |
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equiangular |
all angles in the interior of the polygon |
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regular polygon |
a convex polygon that is both equilateral and equiangular |
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circumference |
pi x diameter, 2 x pi x radius |