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35 Cards in this Set
- Front
- Back
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acute angle |
measures less than 90 degrees |
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adjacent angles |
share a vertex and a side but have no interior points incommon |
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arc |
part of a circle |
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central angle |
an angle with its vertex at the center of acircle |
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chord |
a segment with both endpoints on a circle |
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circle |
a set of points in a plane that are all the samedistance from a given point called the center |
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complementary |
the sum of the measures of two angles is 90degrees |
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congruent |
equal |
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decagon |
ten-sided polygon |
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diameter |
a segment that passes through the center of acircle and has both endpoints on the circle |
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equilateral triangle |
all 3 sides the same length |
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hexagon |
a polygon with six sides |
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isosceles triangle |
has at least two congruent sides |
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line |
a series of points that extend in oppositedirections without end |
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obtuse angle |
measures between 90 degrees and 180 degrees |
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octagon |
an eight-sided polygon |
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parallel lines |
lines that are in the same plane that neverintersect |
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parallelogram |
quadrilateral with both pairs of opposite sidesparallel |
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pentagon |
a polygon with 5 sides |
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perpendicular lines |
form right angles |
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plane |
flat surface that extends indefinitely in alldirections and has no thickness |
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radius |
segment that connects the center of a circle tothe circle |
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ray |
part of a line with one endpoint and all thepoints of the line on one side of the endpoint |
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rectangle |
a parallelogram with four right angles |
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regular polygon |
all sides and all angles congruent |
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rhombus |
quadrilateral that is a parallelogram with four congruentsides |
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scalene triangle |
no congruent sides |
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segment |
two endpoints and all the points of the line between thepoints |
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skew lines |
do not lie in the same plane and are neitherparallel nor intersecting |
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square |
a parallelogram with four right angles and fourcongruent sides |
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straight angle |
an angle with a measure of 180 degrees |
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supplementary |
angles whose sum is 180 degrees |
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trapezoid |
quadrilateral with exactly one pair of parallelsides |
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vertex |
any point where two sides of a polygon meet |
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vertical angles |
formed by two intersecting lines and are opposite eachother |
