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philomath_geometry_a_vocab_01
first common list of vocabulary terms for geometry a
18
Mathematics
10th Grade
08/08/2011

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Term
collinear
Definition
lying on the same line
Term
coplanar
Definition
lying in the same plane
Term
segment
Definition
a part of a line that begins at one point and ends at another
Term
ray
Definition
a part of a line that starts at a point and extends infinitely in one direction
Term
angle
Definition
a figure formed by two rays with a common endpoint
Term
vertex of an angle
Definition
the point in common of the two rays that form an angle
Term
interior of an angle
Definition
the region of a plane that falls between the two rays that form an angle (i.e., If two points, one from each side of an angle, are connected by a segment, the segment will pass through the __________ of the angle)
Term
exterior of an angle
Definition
the portion of the plane containing an angle that is not in the angle's interior
Term
intersect
Definition
to have one or more points in common
Term
intersection
Definition
the set of all points that two geometric figures have in common
Term
postulate
Definition
a statement that is accepted as true without proof (__________s are also known as axioms)
Term
congruent
Definition

Having the same size and shape. Segments are __________ if they have the same length. Angles are __________ if they have the same measure.

 

Term
degree
Definition
The most common unit of angle measure. When an angle spanning a half circle is divided into 180 equal parts, one of those parts measure one __________.
Term
complementary angles, complement
Definition
Two angles whose measures have a sum of 90 degrees.
Term
supplementary angles
Definition
Two angles whose measures have a sum of 180 degrees.
Term
right angle
Definition
An angle whose measure is 90 degrees.
Term
acute angle
Definition
An angle whose measure is less than 90 degrees.
Term
obtuse angle
Definition
An angle whose measure is more than 90 degrees and less than 180 degrees.
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