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Geometry Vocabulary

Vocabulary 6th grade

TermDefinition
Point a geometric object that has no dimensions, only a location
Plane flat surface that extends in all directions endlessly; two dimentional
Angle two rays joined with a common endpoint; the two rays are called the sides of a angle
Ray part of a line that only has one endpoint
Vertex the common endpoint of a angle
Line segment part of a line that has two endpoints
line a set of points along a straight path having no endpoints
Intersecting lines lines that have just one point in common
Skew Lines lines that are not in the same plane and do not intersect
Straight angle angle that measures 180 degrees
Zero angle angle with a measure of 0 degrees
right angle angle that measures 90 degrees
Acute angle angle that measures less than 90 degrees
obtuse angle angle that measures more than 90 degrees and less than 180 degrees
Reflex angle angle that measures more than 180 degrees and less than 360 degrees
Perigon (or revolution) a angle that equals exactly 360 degrees
congruent angles angles that have the same measurement
supplementary angles two angles whose measures add up to 180 degrees; any 2 right angles are supplementary
complementary angles any 2 angles whose measures add up to 90 degrees
transversal a line that intersects two other angles
adjacent angles two angles that share a side or ray and a vertex
vertical angles a pair of opposite angles formed by intersecting lines
corresponding angles two lines intersected by transversal form corresponding pairs of angles; if the two lines are parallel the corresponding pairs of angles are congruent
triangle polygon with 3 sides, 3 angles, and 3 vertices
equilateral triangle all sides congruent
isosceles triangle AT LEAST 2 sides congruent
scalene triangle no sides congruent
Equiangular triangle all angles congruent; regular triangle
acute triangle all angles are acute
right triangle one right angle
obtuse triangle one obtuse angle
Created by: amandam04
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