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31 Cards in this Set
- Front
- Back
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Point |
no size, no dimension
represented by a dot |
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Line |
one dimension represented by a line with 2 arrowheads |
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Plane |
two dimensions flat surface extends in all directions named by at least 3 points |
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Line Segment |
two endpoints |
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Ray |
part of a line with one endpoint |
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opposite rays |
same endpoint opposite directions |
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collinear |
two points on same line |
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coplanar points |
2 points on same
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Postulate |
a statement that is accepted without proof |
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Theorem |
a rule that must be proved true |
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ruler postulate |
allow you to measure in the length of segments |
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Segment Addition Postulate |
If B is between A and C then AB+BC=AC If AB+BC=AC then B is between A and C. |
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Congruent Segments |
have equal length |
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Midpoint |
divides a segment into two congruent segments |
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Segment Bisector |
a line, ray, or segment that intersects a seg at its midpoint |
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Angle |
consists of two rays with a common endpoint |
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Protractor Postulate |
allows us to measure the size of angles in degrees |
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Angle Addition Postulate |
if P is on the interior of Angle ABC, then the measure of angle ABP+the measure of angle PBC= the measure of angle ABC |
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Congruent Angles |
have equal measure |
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Angle Bisector |
a ray that divides an angle into 2 congruent angles |
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Complementary Angles |
a pair of angles whose sum is 90 |
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Supplementary Angles |
a pair of angles whose sum is 180 |
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Adjacent Angles |
A pair of angles that share a vertex on the side but have no common interior points |
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Linear Pair |
two adjacent angles are a linear pair if their non common sides form opposite rays |
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Linear Pair Postulate |
angles in a linear pair are supplementary |
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Vertical Angles |
2 angles are vertical angles if their sides form two pairs of opposite rays |
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Polygon |
Formed by 3 or more sides and each side intersects exactly two other sides, one at each endpoint, no 2 sides with a common endpoint are collinear |
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Convex |
no line that contains a side goes through the interior of the polygon |
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Equilateral polygon |
all sides are congruent
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Equiangular |
all angles are congruent |
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Regular Polygon |
both equilateral and equiangular |
